Instances Created From Merge Actor Have Corrupt Lightmaps

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.

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

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

Expected:
No issues with the light map

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