Using Alt-Drag to move a copy of an actor from the persistent level to a sublevel (when the sublevel is selected as the current level in the Levels window), the persistent level is getting marked as dirty.
Clarification: This does not only affect the persistent level. This will also affect a sublevel if the object is moved from SublevelA to SublevelB, for example.
Reproduced: 4.16.3 and 4.18 Main CL# 359616
Result: The persistent level gets marked as dirty
Expected: Only the sublevel would get marked as dirty.
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