diff --git a/cubiomes b/cubiomes
index 6d1a190..e61f905 160000
--- a/cubiomes
+++ b/cubiomes
@@ -1 +1 @@
-Subproject commit 6d1a190fe63210ce32d08d87388748a73c5ea7e1
+Subproject commit e61f90580cbdd883214a8054670dacae655e59c0
diff --git a/cubiomes-viewer.pro b/cubiomes-viewer.pro
index f148e7e..5a6b92b 100644
--- a/cubiomes-viewer.pro
+++ b/cubiomes-viewer.pro
@@ -20,6 +20,9 @@ greaterThan(QT_MAJOR_VERSION, 5) {
     DEFINES += QT_DISABLE_DEPRECATED_UP_TO=0x050F00
 } else {
     QMAKE_CXXFLAGS += -std=gnu++11
+    gcc {
+        QMAKE_CXXFLAGS += -Wno-deprecated-copy
+    }
 }
 
 win32: {
@@ -54,10 +57,6 @@ static_gnu: {
     LIBS += -static -static-libgcc -static-libstdc++
 }
 
-gcc {
-    greaterThan(QMAKE_GCC_MAJOR_VERSION, 9): QMAKE_CXXFLAGS += -Wno-deprecated-copy
-}
-
 CONFIG(debug, debug|release): {
     CUTARGET = debug
 } else {
diff --git a/etc/com.github.cubitect.cubiomes-viewer.metainfo.xml b/etc/com.github.cubitect.cubiomes-viewer.metainfo.xml
index 71106e7..b0b5e4f 100644
--- a/etc/com.github.cubitect.cubiomes-viewer.metainfo.xml
+++ b/etc/com.github.cubitect.cubiomes-viewer.metainfo.xml
@@ -13,6 +13,15 @@
   </description>
 
   <releases>
+    <release version="4.1.2" date="2024-11-10">
+      <description>
+        <p>Changes:</p>
+        <ul>
+          <li>Renamed 1.21.3 to 1.21 WD and 1.21.2 to 1.21.3 to match the Winter Drop</li>
+          <li>Fixed the World Spawn for 1.21.2+</li>
+        </ul>
+      </description>
+    </release>
     <release version="4.1.0" date="2024-10-07">
       <description>
         <p>Changes:</p>
diff --git a/src/aboutdialog.h b/src/aboutdialog.h
index d03a505..11a774d 100644
--- a/src/aboutdialog.h
+++ b/src/aboutdialog.h
@@ -6,7 +6,7 @@
 
 #define VERS_MAJOR 4
 #define VERS_MINOR 1
-#define VERS_PATCH 1   // negative patch number designates a development version
+#define VERS_PATCH 2   // negative patch number designates a development version
 
 // returns +1 if newer, -1 if older  and 0 if equal
 inline int cmpVers(int major, int minor, int patch)
diff --git a/src/conditiondialog.cpp b/src/conditiondialog.cpp
index 13ebd7c..787a4fc 100644
--- a/src/conditiondialog.cpp
+++ b/src/conditiondialog.cpp
@@ -42,8 +42,7 @@ ConditionDialog::ConditionDialog(FormConditions *parent, MapView *mapview, Confi
     textDescription->setSizeAdjustPolicy(QAbstractScrollArea::AdjustToContents);
     ui->collapseDescription->init(tr("Description/Notes"), textDescription, true);
 
-    const char *p_mcs = mc2str(wi.mc);
-    QString mcs = tr("MC %1", "Minecraft version").arg(p_mcs ? p_mcs : "?");
+    QString mcs = tr("MC %1", "Minecraft version").arg(mc2str(wi.mc));
     ui->labelMC->setText(mcs);
 #if QT_VERSION < QT_VERSION_CHECK(5, 10, 0)
     ui->textEditLua->setTabStopWidth(txtWidth(ui->textEditLua->font(), "    "));
diff --git a/src/config.cpp b/src/config.cpp
index 40f6bc2..4c98527 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -91,7 +91,7 @@ bool WorldInfo::read(const QString& line)
     if (sscanf(p, "#MC:       %8[^\n]", buf) == 1)
     {
         mc = str2mc(buf);
-        if (mc < 0)
+        if (mc == MC_UNDEF)
             mc = MC_DEFAULT;
         return true;
     }
diff --git a/src/config.h b/src/config.h
index 35fdd55..ee169fc 100644
--- a/src/config.h
+++ b/src/config.h
@@ -15,7 +15,7 @@
 
 #define PRECOMPUTE48_BUFSIZ ((int64_t)1 << 30)
 
-enum { MC_DEFAULT = MC_1_21_2 };
+enum { MC_DEFAULT = MC_1_21_3 };
 
 struct ExtGenConfig
 {
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 0af5343..68e7a3f 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -361,7 +361,7 @@ bool MainWindow::getSeed(WorldInfo *wi, bool applyrand)
     bool ok = true;
     const std::string& mcs = ui->comboBoxMC->currentText().toStdString();
     wi->mc = str2mc(mcs.c_str());
-    if (wi->mc < 0)
+    if (wi->mc == MC_UNDEF)
     {
         if (applyrand)
             qDebug() << "Unknown MC version: " << mcs.c_str();
@@ -386,13 +386,6 @@ bool MainWindow::getSeed(WorldInfo *wi, bool applyrand)
 
 bool MainWindow::setSeed(WorldInfo wi, int dim)
 {
-    const char *mcstr = mc2str(wi.mc);
-    if (!mcstr)
-    {
-        qDebug() << "Unknown MC version: " << wi.mc;
-        return false;
-    }
-
     if (dim == DIM_OVERWORLD)
         dimactions[0]->setChecked(true);
     if (dim == DIM_NETHER)
@@ -440,7 +433,7 @@ bool MainWindow::setSeed(WorldInfo wi, int dim)
         ui->comboY->addItem(QString::number(wi.y));
     ui->comboY->setCurrentIndex(i);
 
-    ui->comboBoxMC->setCurrentText(mcstr);
+    ui->comboBoxMC->setCurrentText(mc2str(wi.mc));
     ui->seedEdit->setText(QString::asprintf("%" PRId64, (int64_t)wi.seed));
     getMapView()->setSeed(wi, dim, lopt);
 
@@ -703,12 +696,10 @@ void MainWindow::setMCList(bool experimental)
     {
         if (!experimental && mc != wi.mc)
         {
-            if (mc <= MC_1_0 || mc == MC_1_16_1 || mc == MC_1_19_2 || mc == MC_1_21_3)
+            if (mc <= MC_1_0 || mc == MC_1_16_1 || mc == MC_1_19_2 || mc == MC_1_21_1 || mc == MC_1_21_WD)
                 continue;
         }
-        const char *mcs = mc2str(mc);
-        if (mcs)
-            mclist.append(mcs);
+        mclist.append(mc2str(mc));
     }
     const QString s = mc2str(wi.mc);
     ui->comboBoxMC->setEnabled(false);
diff --git a/src/scripts.cpp b/src/scripts.cpp
index 1f17d60..50bbe7c 100644
--- a/src/scripts.cpp
+++ b/src/scripts.cpp
@@ -140,13 +140,7 @@ static int l_getStructures(lua_State *L)
         return 0;
     }
 
-    int dim = DIM_OVERWORLD;
-    if (sconf.properties & STRUCT_NETHER)
-        dim = DIM_NETHER;
-    else if (sconf.properties & STRUCT_END)
-        dim = DIM_END;
-
-    env->init4Dim(dim);
+    env->init4Dim(sconf.dim);
 
     if (styp == End_City)
     {
diff --git a/src/search.cpp b/src/search.cpp
index effbdbf..3ab75f1 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1735,10 +1735,10 @@ testCondAt(
         {
             for (int rx = rx1; rx <= rx2; rx++)
             {
-                if (cond->skipref && rx == at.x >> 4 && rz == at.z >> 4)
-                    continue;
                 if (isSlimeChunk(env->seed, rx, rz))
                 {
+                    if (cond->skipref && rx == at.x >> 4 && rz == at.z >> 4)
+                        continue;
                     if (cond->count == 0)
                     {
                         return COND_FAILED;
diff --git a/src/search.h b/src/search.h
index 084e331..52415c7 100644
--- a/src/search.h
+++ b/src/search.h
@@ -506,7 +506,7 @@ static const struct FilterList : private FilterInfo
         };
 
         list[F_CHAMBERS] = FilterInfo{
-            CAT_STRUCT, 1, LOC_RAD, Trial_Chambers, 1, BR_CLUST, MC_1_21, MC_NEWEST, 0, 0, disp++,
+            CAT_STRUCT, 1, LOC_RAD, Trial_Chambers, 1, BR_CLUST, MC_1_21_1, MC_NEWEST, 0, 0, disp++,
             "chambers",
             QT_TRANSLATE_NOOP("Filter", "Trial chambers"),
             ""
diff --git a/src/tabstructures.cpp b/src/tabstructures.cpp
index 2f8d4cf..9fb48ac 100644
--- a/src/tabstructures.cpp
+++ b/src/tabstructures.cpp
@@ -67,15 +67,10 @@ void AnalysisStructures::runStructs(Generator *g)
         if (!getStructureConfig_override(stype, wi.mc, &sconf))
             continue;
 
-        int sdim = DIM_OVERWORLD;
-        if (sconf.properties & STRUCT_NETHER)
-            sdim = DIM_NETHER;
-        if (sconf.properties & STRUCT_END)
-            sdim = DIM_END;
-        if (dim != DIM_UNDEF && dim != sdim)
+        if (dim != DIM_UNDEF && dim != sconf.dim)
             continue;
 
-        getStructs(&st, sconf, wi, sdim, area.x1, area.z1, area.x2, area.z2);
+        getStructs(&st, sconf, wi, sconf.dim, area.x1, area.z1, area.x2, area.z2);
         if (st.empty())
             continue;
 
@@ -94,7 +89,7 @@ void AnalysisStructures::runStructs(Generator *g)
             item->setData(C_X, Qt::DisplayRole, QVariant::fromValue(vp.p.x));
             item->setData(C_Z, Qt::DisplayRole, QVariant::fromValue(vp.p.z));
             item->setData(0, Qt::UserRole+0, QVariant::fromValue(wi.seed));
-            item->setData(0, Qt::UserRole+1, QVariant::fromValue(sdim));
+            item->setData(0, Qt::UserRole+1, QVariant::fromValue(sconf.dim));
             item->setData(0, Qt::UserRole+2, QVariant::fromValue(vp.p));
             QStringList sinfo = vp.detail();
             if (!sinfo.empty())
diff --git a/src/world.cpp b/src/world.cpp
index 90b06e5..fd6d484 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -379,6 +379,41 @@ void applyHeightShading(unsigned char *rgb, Range r,
     }
 }
 
+void Quad::updateBiomeColor()
+{
+    if (!biomes || !rgb)
+        return;
+    int nptype = -1;
+    if (g->mc >= MC_1_18) nptype = g->bn.nptype;
+    if (g->mc <= MC_B1_7) nptype = g->bnb.nptype;
+    if (dim == DIM_OVERWORLD && nptype >= 0)
+    {   // climate parameter
+        const int *extremes = getBiomeParaExtremes(g->mc);
+        int cmin = extremes[nptype*2 + 0];
+        int cmax = extremes[nptype*2 + 1];
+        for (int i = 0; i < r.sx * r.sz; i++)
+        {
+            double p = (biomes[i] - cmin) / (double) (cmax - cmin);
+            uchar col = (p <= 0) ? 0 : (p >= 1.0) ? 0xff : (uchar)(0xff * p);
+            rgb[3*i+0] = rgb[3*i+1] = rgb[3*i+2] = col;
+        }
+    }
+    else
+    {
+        biomesToImage(rgb, g_biomeColors, biomes, r.sx, r.sz, 1, 1);
+
+        if (lopt.mode == LOPT_HEIGHT)
+        {
+            int stepbits = 0; // interpolated_step = (1 << stepbits)
+            if (scale > 16)
+            {
+                stepbits = 1;
+            }
+            applyHeightShading(rgb, r, g, sn, stepbits, lopt.disp[lopt.mode], false, isdel);
+        }
+    }
+}
+
 void Quad::run()
 {
     if (done || *isdel)
@@ -398,7 +433,8 @@ void Quad::run()
 
         int y = (scale > 1) ? wi.y >> 2 : wi.y;
         int x = ti*pixs, z = tj*pixs, w = pixs, h = pixs;
-        Range r = {scale, x, z, w, h, y, 1};
+        r = {scale, x, z, w, h, y, 1};
+
         biomes = allocCache(g, r);
         if (!biomes) return;
 
@@ -415,39 +451,8 @@ void Quad::run()
                 biomes[i] = -1;
         }
 
-        rgb = new uchar[w*h * 3];
-        int nptype = -1;
-        if (g->mc >= MC_1_18) nptype = g->bn.nptype;
-        if (g->mc <= MC_B1_7) nptype = g->bnb.nptype;
-        if (dim == DIM_OVERWORLD && nptype >= 0)
-        {   // climate parameter
-            const int *extremes = getBiomeParaExtremes(g->mc);
-            int cmin = extremes[nptype*2 + 0];
-            int cmax = extremes[nptype*2 + 1];
-            for (int i = 0; i < w*h; i++)
-            {
-                double p = (biomes[i] - cmin) / (double) (cmax - cmin);
-                uchar col = (p <= 0) ? 0 : (p >= 1.0) ? 0xff : (uchar)(0xff * p);
-                rgb[3*i+0] = rgb[3*i+1] = rgb[3*i+2] = col;
-            }
-        }
-        else
-        {
-            // sync biomeColors
-            g_mutex.lock();
-            g_mutex.unlock();
-            biomesToImage(rgb, g_biomeColors, biomes, w, h, 1, 1);
-
-            if (lopt.mode == LOPT_HEIGHT)
-            {
-                int stepbits = 0; // interpolated_step = (1 << stepbits)
-                if (scale > 16)
-                {
-                    stepbits = 1;
-                }
-                applyHeightShading(rgb, r, g, sn, stepbits, lopt.disp[lopt.mode], false, isdel);
-            }
-        }
+        rgb = new uchar[w*h * 3]();
+        updateBiomeColor();
         img = new QImage(rgb, w, h, 3*w, QImage::Format_RGB888);
     }
     else if (pixs < 0)
@@ -914,25 +919,16 @@ int QWorld::estimateSurface(Pos p)
     return (int) floor(y);
 }
 
-static void refreshQuadColor(Quad *q)
-{
-    QImage *img = q->img;
-    if (!img)
-        return;
-    if (q->lopt.mode <= LOPT_OCEAN_256 || q->g->mc < MC_1_18 || q->dim != 0 || q->g->bn.nptype < 0)
-        biomesToImage(q->rgb, g_biomeColors, q->biomes, img->width(), img->height(), 1, 1);
-}
-
 void QWorld::refreshBiomeColors()
 {
     QMutexLocker locker(&g_mutex);
     for (Level& l : lvb)
     {
         for (Quad *q : l.cells)
-            refreshQuadColor(q);
+            q->updateBiomeColor();
     }
     for (Quad *q : cachedbiomes)
-        refreshQuadColor(q);
+        q->updateBiomeColor();
 }
 
 void QWorld::clear()
diff --git a/src/world.h b/src/world.h
index aeefb79..c130206 100644
--- a/src/world.h
+++ b/src/world.h
@@ -58,6 +58,7 @@ struct Quad : public Scheduled
     ~Quad();
 
     void run();
+    void updateBiomeColor();
 
     WorldInfo wi;
     int dim;
@@ -70,6 +71,7 @@ struct Quad : public Scheduled
     int blocks;
     int pixs;
     int sopt;
+    Range r;
 
     int *biomes;
     uchar *rgb;