This issue occurs when merging static meshes that have multiple LODs.

If they are using UV1 for lightmap index, after merging, the UV1 of the result for each LODs will all be differents, making the lightning totally screwed when displaying anything but LOD0.

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ComponentUE - LD & Art - World Building - HLOD
Affects Versions4.27
Target Fix5.1
CreatedJul 11, 2022
UpdatedJul 13, 2022