diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 5789233..850c705 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -3061,10 +3061,15 @@ function _system_rebuild_theme_data() {
         $themes[$key]->prefix = $key;
       }
     }
-    // Inherit all the data from the current base theme, and override it with
-    // the specific subtheme settings.
+    // Inherit the data from the current base theme, and override it with the
+    // specific subtheme settings.
+    $basetheme_info = $themes[$base_theme]->info;
+    // Remove stylesheets-override and stylesheets-remove from the info array,
+    // these settings should not be inherited by subthemes.
+    // @see _drupal_theme_initialize().
+    unset($basetheme_info['stylesheets-override'], $basetheme_info['stylesheets-remove']);
     $nestedArray = new NestedArray();
-    $subtheme_info = $nestedArray::mergeDeep($themes[$base_theme]->info, $themes[$key]->info);
+    $subtheme_info = $nestedArray::mergeDeep($basetheme_info, $themes[$key]->info);
     $themes[$key]->info = $subtheme_info;
   }