diff --git a/CHANGELOG.md b/CHANGELOG.md
index b08558b834..8fd1423edd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,10 +7,14 @@
 * Extra bundle detection when using external build module works properly now.
 * Widget players are now properly invoked when they arrive later in the page load process.
 * Fix permission grid tooltip display.
+* Fixes a bug that crashes external frontend applications.
+* Fixes a false positive warning for module not in use for project level submodules (e.g. `widges/module.js`) and dot-folders (e.g. `.DS_Store`).
 
 ### Adds
 
 * It's possible now to target the HMR build when registering via `template.append` and `template.prepend`. Use `when: 'hmr:public'` or `when: 'hmr:apos'` that will be evaluated against the current asset `options.hmr` configuration.
+* Adds asset module option `options.modulePreloadPolyfill` (default `true`) to allow disabling the polyfill preload for e.g. external front-ends. 
+* Adds `bundleMarkup` to the data sent to the external front-end, containing all markup for injecting Apostrophe UI in the front-end.
 
 ## 4.9.0 (2024-10-31)
 
diff --git a/index.js b/index.js
index 3e7b2f713c..2106f04c9f 100644
--- a/index.js
+++ b/index.js
@@ -699,11 +699,18 @@ async function apostrophe(options, telemetry, rootSpan) {
       }
     }
     async function testDir(name) {
+      if (name.startsWith('.')) {
+        return;
+      }
       // Projects that have different theme modules activated at different times
       // are a frequent source of false positives for this warning, so ignore
       // seemingly unused modules with "theme" in the name
       if (!validSteps.includes(name)) {
         try {
+          // It's a project level modules definition, skip it.
+          if (fs.existsSync(path.resolve(self.localModules, name, 'modules.js'))) {
+            return;
+          }
           const submodule = await self.root.import(path.resolve(self.localModules, name, 'index.js'));
           if (submodule && submodule.options && submodule.options.ignoreUnusedFolderWarning) {
             return;
diff --git a/modules/@apostrophecms/asset/index.js b/modules/@apostrophecms/asset/index.js
index fb6cc3a556..3482ba9c33 100644
--- a/modules/@apostrophecms/asset/index.js
+++ b/modules/@apostrophecms/asset/index.js
@@ -98,6 +98,10 @@ module.exports = {
     // Force the HMR WS port when it operates on the same process as Apostrophe.
     // Most of the time you won't need to change this.
     hmrPort: null,
+    // Let the external build module inject a pollyfill for the module preload,
+    // adding the `modulepreload` support for the browsers that don't support it.
+    // Can be disabled in e.g. external front-ends.
+    modulePreloadPolyfill: true,
     // Completely disable the asset runtime auto-build system.
     // When an external build module is registered, only manifest data
     // will be loaded and no build will be executed.
@@ -477,6 +481,7 @@ module.exports = {
       // - `devServer`: if `false`, the dev server is disabled. Otherwise, it's a string
       //   (enum) `public` or `apos`. Note that if `hmr` is disabled, the dev server will be always
       //   `false`.
+      // - `modulePreloadPolyfill`: if `true`, a module preload polyfill is injected.
       // - `types`: optional array, if present it represents the only entrypoint types (entrypoint.type)
       //   that should be built.
       // - `sourcemaps`: if `true`, the source maps are generated in production.
@@ -494,15 +499,16 @@ module.exports = {
           isTask: !argv['check-apos-build'],
           hmr: self.hasHMR(),
           hmrPort: self.options.hmrPort,
+          modulePreloadPolyfill: self.options.modulePreloadPolyfill,
           sourcemaps: self.options.productionSourceMaps
         };
         options.devServer = !options.isTask && self.hasDevServer()
           ? self.options.hmr
           : false;
 
-        // Skip all public and keep only the apos scenes.
+        // Skip prebundled UI and keep only the apos scenes.
         if (!self.options.publicBundle) {
-          options.types = [ 'apos', 'bundled' ];
+          options.types = [ 'apos', 'index' ];
         }
 
         return options;
diff --git a/modules/@apostrophecms/asset/lib/build/external-module-api.js b/modules/@apostrophecms/asset/lib/build/external-module-api.js
index 56cf9b5302..9f92638d48 100644
--- a/modules/@apostrophecms/asset/lib/build/external-module-api.js
+++ b/modules/@apostrophecms/asset/lib/build/external-module-api.js
@@ -69,13 +69,8 @@ module.exports = (self) => {
     // Returns an array of objects with the following properties:
     // - `name`: the entrypoint name. It's usually the relative to `ui` folder
     //   name(`src`, `apos`, `public`) or an extra bundle name.
+    // - `label`: the human-readable label for the entrypoint, used to print CLI messages.
     // - `type`: (enum) the entrypoint type. It can be `index`, `apos`, `custom` (e.g. extra bundles) or
-    //   `bundled` (e.g. `ui/public`). Every type has associated manager that provides handling for the entrypoint.
-    // - `useMeta`: if `true`, the entrypoint will be created based on the source metadata (see
-    //   `computeSourceMeta()` method).
-    // - `bundle`: if `true`, the entrypoint should be bundled by the build module.
-    // - `index`: if `true`, the entrypoint processes only `{name}/index.{js,scss}` module files.
-    // - `apos`: if `true`, the entrypoint processes components, icons and apps.
     // - `ignoreSources`: an array of sources that shouldn't be processed when creating the entrypoint.
     // - `sources`: an object with `js` and `scss` arrays of extra sources to be included in the entrypoint.
     //    These sources are not affected by the `ignoreSources` configuration.
@@ -84,10 +79,15 @@ module.exports = (self) => {
     // - `prologue`: a string with the prologue to be added to the entrypoint.
     // - `condition`: the JS `module` or `nomodule` condition. Undefined for no specific condition.
     // - `outputs`: an array of output extensions for the entrypoint (currently not fully utilized)
+    // - `inputs`: an array of input extensions for the entrypoint (currently not fully utilized)
     // - `scenes`: an array of scenes to be in the final post-bundle step. The scenes are instructions
     //   for the Apostrophe core to combine the builds and release them. Currently supported scenes are
     //   `apos` and `public` and custom scene names equal to extra bundle (only those who should be
     //   loaded separately in the browser).
+    //
+    // Additonal properties added after entrypoints are processed by the core and the external build module:
+    // - `manifest`: object, see the manifest section of `configureBuildModule()` docs for more information.
+    // - `bundles`: a `Set` containing the bundle names that this entrypoint is part of (both css and js).
     getBuildEntrypoints(types, recompute = false) {
       if (!self.hasBuildModule()) {
         return self.builds;
diff --git a/modules/@apostrophecms/asset/lib/build/internals.js b/modules/@apostrophecms/asset/lib/build/internals.js
index 8e8539945e..9bf354e57d 100644
--- a/modules/@apostrophecms/asset/lib/build/internals.js
+++ b/modules/@apostrophecms/asset/lib/build/internals.js
@@ -88,7 +88,7 @@ module.exports = (self) => {
               enhancedConfig.ignoreSources.push(...bundleConfig.scss);
             }
             // 2.3. Add the extra bundle configuration so that
-            // it only processes the configured `sources` (`useMeta: false`).
+            // it only processes the configured `sources`
             if (!bundleConfig.main) {
               entrypoints.push({
                 name: bundleName,
diff --git a/modules/@apostrophecms/schema/lib/addFieldTypes.js b/modules/@apostrophecms/schema/lib/addFieldTypes.js
index c8530f70a5..3741962f2c 100644
--- a/modules/@apostrophecms/schema/lib/addFieldTypes.js
+++ b/modules/@apostrophecms/schema/lib/addFieldTypes.js
@@ -861,7 +861,9 @@ module.exports = (self) => {
 
   self.addFieldType({
     name: 'object',
-    async convert(req, field, data, destination, { fetchRelationships = true, ancestors = {}, doc = {} } = {}) {
+    async convert(req, field, data, destination, {
+      fetchRelationships = true, ancestors = {}, doc = {}
+    } = {}) {
       data = data[field.name];
       const schema = field.schema;
       const errors = [];
diff --git a/modules/@apostrophecms/template/index.js b/modules/@apostrophecms/template/index.js
index 2c749a1cb9..9a3c1c3e88 100644
--- a/modules/@apostrophecms/template/index.js
+++ b/modules/@apostrophecms/template/index.js
@@ -1054,6 +1054,24 @@ module.exports = {
         data.template = template;
         // For simple cases (not piece pages and the like)
         data.module = moduleName;
+
+        // Provide the `apos` scene bundles to the exsternal front-end
+        if (self.apos.asset.hasBuildModule()) {
+          const modulePreload = new Set();
+          data.bundleMarkup = {
+            js: self.apos.asset.getBundlePageMarkup({
+              scene: 'apos',
+              output: 'js',
+              modulePreload
+            }),
+            css: self.apos.asset.getBundlePageMarkup({
+              scene: 'apos',
+              output: 'css'
+            })
+          };
+          data.bundleMarkup.js.push(...Array.from(modulePreload));
+        }
+
         return data;
       },