Instances Created From Merge Actor Have Corrupt Lightmaps.

Working as intended in 4.20 CL# 4369336 and 4.21 CL# 4753647

Found in 4.22 CL# 6574378 and 4.23 CL# 6842436

This is a regression.

Steps to Reproduce
  1. Open attached project
  2. Open the level under Valley > Maps in the content browser
  3. Load the level 3-5 times

When loading the map the lightmap for the instances meshes will load incorrectly

No issues with the light map

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Affects Versions4.224.23
Target Fix4.23
Fix Commit7280883
Main Commit7280885
Release Commit7280883
CreatedJun 6, 2019
ResolvedJul 11, 2019
UpdatedFeb 12, 2020