diff --git a/framework/core/src/Api/Controller/SetSettingsController.php b/framework/core/src/Api/Controller/SetSettingsController.php
index f587ec92c9..eca891eacb 100644
--- a/framework/core/src/Api/Controller/SetSettingsController.php
+++ b/framework/core/src/Api/Controller/SetSettingsController.php
@@ -21,7 +21,7 @@
 
 class SetSettingsController implements RequestHandlerInterface
 {
-    public static array $filter = [];
+    public static array $resetWhen = [];
 
     public function __construct(
         protected SettingsRepositoryInterface $settings,
@@ -39,14 +39,8 @@ public function handle(ServerRequestInterface $request): ResponseInterface
 
         foreach ($settings as $k => $v) {
             $this->dispatcher->dispatch(new Event\Serializing($k, $v));
-            $filterCallback = Arr::get(static::$filter, $k);
-            $shouldFilter = false;
 
-            if (! is_null($filterCallback)) {
-                $shouldFilter = $filterCallback($v);
-            }
-
-            if ($shouldFilter) {
+            if (! is_null($resetWhen = Arr::get(static::$resetWhen, $k)) && $resetWhen($v)) {
                 $this->settings->delete($k);
             } else {
                 $this->settings->set($k, $v);
diff --git a/framework/core/src/Extend/Settings.php b/framework/core/src/Extend/Settings.php
index 2a6d803944..e177146761 100644
--- a/framework/core/src/Extend/Settings.php
+++ b/framework/core/src/Extend/Settings.php
@@ -26,7 +26,7 @@ class Settings implements ExtenderInterface
     private array $defaults = [];
     private array $lessConfigs = [];
     private array $resetJsCacheFor = [];
-    private array $filter = [];
+    private array $resetWhen = [];
 
     /**
      * Serialize a setting value to the ForumSerializer attributes.
@@ -66,13 +66,15 @@ public function default(string $key, mixed $value): self
     }
 
     /**
-     * Reset a setting to default when callback returns true.
+     * Delete a custom setting value when the callback returns true.
+     * This allows the setting to be reset to its default value.
+     *
      * @param string $key: The key of the setting.
-     * @param (callable(mixed $value): bool)|bool $callback: Boolean to determine whether the setting needs deleted.
+     * @param (callable(mixed $value): bool) $callback: The callback to determine if the setting should be reset.
      */
-    public function filter(string $key, callable|bool $callback): self
+    public function resetWhen(string $key, callable|string $callback): self
     {
-        $this->filter[$key] = $callback;
+        $this->resetWhen[$key] = $callback;
 
         return $this;
     }
@@ -128,10 +130,10 @@ public function extend(Container $container, Extension $extension = null): void
             });
         }
 
-        if (! empty($this->filter)) {
-            foreach ($this->filter as $key => $callback) {
+        if (! empty($this->resetWhen)) {
+            foreach ($this->resetWhen as $key => $callback) {
                 Arr::set(
-                    SetSettingsController::$filter,
+                    SetSettingsController::$resetWhen,
                     $key,
                     ContainerUtil::wrapCallback($callback, $container)
                 );
diff --git a/framework/core/tests/integration/extenders/SettingsTest.php b/framework/core/tests/integration/extenders/SettingsTest.php
index 0787cb0c0f..c96a882c7d 100644
--- a/framework/core/tests/integration/extenders/SettingsTest.php
+++ b/framework/core/tests/integration/extenders/SettingsTest.php
@@ -188,12 +188,12 @@ public function null_custom_setting_returns_null()
     }
 
     #[Test]
-    public function filtering_setting_returns_default_value()
+    public function resetting_setting_returns_default_value()
     {
         $this->extend(
             (new Extend\Settings())
                 ->default('custom-prefix.filter_this_setting', 'extenderDefault')
-                ->filter('custom-prefix.filter_this_setting', function (mixed $value): bool {
+                ->resetWhen('custom-prefix.filter_this_setting', function (mixed $value): bool {
                     return $value === '';
                 })
         );
@@ -215,6 +215,26 @@ public function filtering_setting_returns_default_value()
         $this->assertEquals('extenderDefault', $value);
     }
 
+    #[Test]
+    public function not_resetting_setting_returns_value()
+    {
+        $this->send(
+            $this->request('POST', '/api/settings', [
+                'authenticatedAs' => 1,
+                'json' => [
+                    'custom-prefix.filter_this_setting' => ''
+                ]
+            ])
+        );
+
+        $value = $this->app()
+            ->getContainer()
+            ->make('flarum.settings')
+            ->get('custom-prefix.filter_this_setting');
+
+        $this->assertEquals('', $value);
+    }
+
     #[Test]
     public function custom_less_var_does_not_work_by_default()
     {