This problem also occurs when the Create Convex Polygons checkbox is checked in the Pen tool.

Steps to Reproduce

Create a BSP
Execute Optimize from the Brush Editing menu

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There's no existing public thread on this issue, so head over to AnswerHub just mention UE-119206 in the post.

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ComponentTools - BSP
Affects Versions4.26
Target Fix4.27.1
CreatedJul 1, 2021
UpdatedJul 14, 2021