diff --git a/source/blender/blenkernel/BKE_collection.h b/source/blender/blenkernel/BKE_collection.h
index 0d33d86ec16..47ed42cade9 100644
--- a/source/blender/blenkernel/BKE_collection.h
+++ b/source/blender/blenkernel/BKE_collection.h
@@ -142,6 +142,8 @@ bool BKE_collection_child_add(struct Main *bmain,
                               struct Collection *parent,
                               struct Collection *child);
 
+bool BKE_collection_child_add_no_sync(struct Collection *parent, struct Collection *child);
+
 bool BKE_collection_child_remove(struct Main *bmain,
                                  struct Collection *parent,
                                  struct Collection *child);
diff --git a/source/blender/blenkernel/intern/collection.c b/source/blender/blenkernel/intern/collection.c
index 68a38c94ff7..c1c3cc62f11 100644
--- a/source/blender/blenkernel/intern/collection.c
+++ b/source/blender/blenkernel/intern/collection.c
@@ -1057,6 +1057,11 @@ bool BKE_collection_child_add(Main *bmain, Collection *parent, Collection *child
   return true;
 }
 
+bool BKE_collection_child_add_no_sync(Collection *parent, Collection *child)
+{
+  return collection_child_add(parent, child, 0, true);
+}
+
 bool BKE_collection_child_remove(Main *bmain, Collection *parent, Collection *child)
 {
   if (!collection_child_remove(parent, child)) {
diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index b52c3f67b2f..322043d7140 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -1757,7 +1757,11 @@ static Collection *single_object_users_collection(Main *bmain,
         bmain, scene, child->collection, flag, copy_collections, false);
 
     if (is_master_collection && copy_collections && child->collection != collection_child_new) {
-      BKE_collection_child_add(bmain, collection, collection_child_new);
+      /* We do not want a collection sync here, our collections are in a complete unsetled state
+       * currently. With current code, that would lead to a memory leak - because of reasons.
+       * It would be a useless loss of computing anyway, since caller has to fully refresh
+       * viewlayers/collections caching at the end. */
+      BKE_collection_child_add_no_sync(collection, collection_child_new);
       BLI_remlink(&collection->children, child);
       MEM_freeN(child);
       if (child == orig_child_last) {