Problems with Unreal 4.20 and Datasmith

[UE4_Archviz]

@OsumGuy

This issue is still happening for me in 4.22.3. I exit unreal and reopen it and some assets’ lightmaps get corrupted like shown in the video. Is there something i can do on my end to solve it other that regenerating the UVs for each asset?

you r facing this issue in 4.22.3. weird. this time version is different, in my guess your unreal files must be corrupted. do clean installation again.