Licensee has suggested a fix:
"Switching to >= resolves the problem: in GPUFastFourierTransform2DCore.ush, `bool InWindow = ...` at lines 127, 144, 170, and 185."
Licensee repro steps recreated in this sample project - [Link Removed]
Licensee repro steps -
Corruption should begin in the corners of the viewport, and then start to impact the whole viewport gradually.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-116736 in the post.