5 files changed, 16 insertions, 3 deletions
diff --git a/source/blender/editors/include/ED_mesh.h b/source/blender/editors/include/ED_mesh.h
index 835e1b4e26f..4bf43a2034a 100644
--- a/source/blender/editors/include/ED_mesh.h
+++ b/source/blender/editors/include/ED_mesh.h
@@ -83,6 +83,7 @@ void EDBM_mesh_clear(struct BMEditMesh *em);
 void EDBM_selectmode_to_scene(struct bContext *C);
 void EDBM_mesh_make(struct Object *ob, const int select_mode, const bool add_key_index);
 void EDBM_mesh_free(struct BMEditMesh *em);
+void EDBM_mesh_load_ex(struct Main *bmain, struct Object *ob, bool free_data);
 void EDBM_mesh_load(struct Main *bmain, struct Object *ob);
 
 /* flushes based on the current select mode.  if in vertex select mode,
diff --git a/source/blender/editors/mesh/editmesh_tools.c b/source/blender/editors/mesh/editmesh_tools.c
index 8df392fb04b..59090acf433 100644
--- a/source/blender/editors/mesh/editmesh_tools.c
+++ b/source/blender/editors/mesh/editmesh_tools.c
@@ -4197,7 +4197,12 @@ static bool mesh_separate_loose(
   BM_mesh_elem_hflag_disable_all(bm_old, BM_VERT | BM_EDGE | BM_FACE, BM_ELEM_SELECT, false);
 
   if (clear_object_data) {
-    BM_mesh_bm_to_me(NULL, bm_old, me_old, (&(struct BMeshToMeshParams){0}));
+    BM_mesh_bm_to_me(NULL,
+                     bm_old,
+                     me_old,
+                     (&(struct BMeshToMeshParams){
+                         .update_shapekey_indices = true,
+                     }));
   }
 
 finally:
diff --git a/source/blender/editors/mesh/editmesh_undo.c b/source/blender/editors/mesh/editmesh_undo.c
index 44984251243..d07ba05de20 100644
--- a/source/blender/editors/mesh/editmesh_undo.c
+++ b/source/blender/editors/mesh/editmesh_undo.c
@@ -521,6 +521,7 @@ static void *undomesh_from_editmesh(UndoMesh *um, BMEditMesh *em, Key *key)
       (&(struct BMeshToMeshParams){
           /* Undo code should not be manipulating 'G_MAIN->object' hooks/vertex-parent. */
           .calc_object_remap = false,
+          .update_shapekey_indices = false,
           .cd_mask_extra = {.vmask = CD_MASK_SHAPE_KEYINDEX},
       }));
 
diff --git a/source/blender/editors/mesh/editmesh_utils.c b/source/blender/editors/mesh/editmesh_utils.c
index 522c2f32d27..42404554ed8 100644
--- a/source/blender/editors/mesh/editmesh_utils.c
+++ b/source/blender/editors/mesh/editmesh_utils.c
@@ -325,7 +325,7 @@ void EDBM_mesh_make(Object *ob, const int select_mode, const bool add_key_index)
  * \warning This can invalidate the #Mesh runtime cache of other objects (for linked duplicates).
  * Most callers should run #DEG_id_tag_update on \a ob->data, see: T46738, T46913
  */
-void EDBM_mesh_load(Main *bmain, Object *ob)
+void EDBM_mesh_load_ex(Main *bmain, Object *ob, bool free_data)
 {
   Mesh *me = ob->data;
   BMesh *bm = me->edit_mesh->bm;
@@ -341,6 +341,7 @@ void EDBM_mesh_load(Main *bmain, Object *ob)
                    me,
                    (&(struct BMeshToMeshParams){
                        .calc_object_remap = true,
+                       .update_shapekey_indices = !free_data,
                    }));
 
   /* Free derived mesh. usually this would happen through depsgraph but there
@@ -380,6 +381,11 @@ void EDBM_mesh_clear(BMEditMesh *em)
   }
 }
 
+void EDBM_mesh_load(Main *bmain, Object *ob)
+{
+  EDBM_mesh_load_ex(bmain, ob, true);
+}
+
 /**
  * Should only be called on the active editmesh, otherwise call #BKE_editmesh_free
  */
diff --git a/source/blender/editors/object/object_edit.c b/source/blender/editors/object/object_edit.c
index be815fb0d10..b7c9579e277 100644
--- a/source/blender/editors/object/object_edit.c
+++ b/source/blender/editors/object/object_edit.c
@@ -445,7 +445,7 @@ static bool ED_object_editmode_load_ex(Main *bmain, Object *obedit, const bool f
       return false;
     }
 
-    EDBM_mesh_load(bmain, obedit);
+    EDBM_mesh_load_ex(bmain, obedit, freedata);
 
     if (freedata) {
       EDBM_mesh_free(me->edit_mesh);