More functional fix for IPC API item modifications

Fixes https://gitlab.com/kicad/code/kicad/-/issues/20206

pcbnew/api/api_handler_pcb.cpp

@@ -478,7 +478,7 @@ HANDLER_RESULT<ItemRequestStatus> API_HANDLER_PCB::handleCreateUpdateItemsIntern
         {
             BOARD_ITEM* boardItem = *optItem;
             commit->Modify( boardItem );
-            boardItem->SwapItemData( item.get() );
+            boardItem->CopyFrom( item.get() );
             boardItem->Serialize( newItem );
         }