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Windows The code written on the instance in the room is locked as DnD and cannot be saved

This BUG only appears in the code on the instance of some rooms, not in the Scripts in the resource tree.

The GML I wrote a long time ago has become DnD, and right-clicking to convert to GML has NO EFFECT.

"Use DnD as default" in the main options has been kept closed, and has nothing to do with this BUG.

Another more serious situation is that the code on instances cannot be saved! No matter what changes I make, as long as I close the code window and reopen it, the code remains the same as before.