It’s simple. If you drag-drop an object that contains parts that are Welded together into another object then the Welds inside all the parts vanish.
Here’s a repro place:
Steps:
- Open ServerStorage
- Drag and Drop the model called “Drag_Me_In” into the model “Drop_Stuff_In_Me”.
- Observe the rersults, all the Welds vanish!
The welds do not get replicated when being drag dropped.
This only occurs in places that aren’t Workspace.