This issue was reported by internal UT developers.

When selecting the surface of a brush that share flush surfaces with other brushes, all surfaces are selected. This seems to only occur after selecting Build, as auto build doesn't reproduce this.

Steps to Reproduce
  1. Open QAGame in UE4Editor
  2. Open attached text file and copy/paste into default level
  3. Select Build
  4. Click the top surfaces of each brush

Result: Selecting a brush surface that is flush with other brush surfaces selects all of them.

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ComponentTools - BSP
Affects Versions4.134.14
Target Fix4.13.1
Fix Commit3111897
Release Commit3163230
CreatedSep 1, 2016
ResolvedSep 2, 2016
UpdatedSep 23, 2019