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

Steps to Reproduce
  1. Create a 5-sided cylinder in BSP
  2. Go into "Brush Editing" mode
  3. Select the top face and click on the "Optimize" tool

Result: the top face is now split into two faces, and they have a small gap between them due to one vertex being slightly offset from the other one.

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

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ComponentUE - LD & Modeling - Modeling Tools - BSP
Affects Versions4.26
Target Fix5.0
Fix Commit17668358
Main Commit17668358
CreatedJul 1, 2021
ResolvedSep 29, 2021
UpdatedDec 1, 2021
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