Drag and drop operations just become broken on packaged builds or launching stand-alone, despite working inside the Editor (PIE). This is a regression from 4.19.2 (CL-4033788).
This issue was reported and tested in 4.20.1 (CL-4233996) and reproduced in Main 4.21 (CL-4299102).
Results: The first time an component is being dragged works as expected, after the second time they can't be dragged anymore
Expected: To be able to drag widget components every time
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-63076 in the post.