Generate Lightmap UVs fails very frequently on FBX imported meshes. 

Found in 4.22 CL# 7053642, 4.23 CL# 8386587, 4.24 CL# 8971176

Steps to Reproduce
  1. Open the Editor
  2. Import any of the FBXs in the attached file
  3. Open UV Channel 2 of the imported mesh
  4. Place the mesh in the scene and build lighting

There will be a dense cluster of overlapping lightmap UVs in the top left corner and when lighting is built it will give bad results

Proper light map UV is generated reliably

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CreatedSep 24, 2019
UpdatedFeb 1, 2022