UDIM textures have default Tiling Method set to Wrap but causes incorrect filtering on edges. It should be set to Clamp or Mirror by default.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-90252 in the post.
|Component||UE - World Creation - Worldbuilding Tools - World Composition|
|Created||Mar 6, 2020|
|Resolved||Mar 23, 2020|
|Updated||Jun 9, 2020|