You can see in the image that the UVs in the build are not representative of those in editor
by user 259070246382469121
Hello there – we have an experimental AI bot 
that might be able to help you with your question. Would you like to try this out?
Probably a duplicate of Discord especially if that is a giant mesh – when compressing the mesh the accuracy/bit depth may not be enough anymore to represent the exact connection
@herbst🌵 It is quite a large mesh so we did wonder if its size was the cause. We can look at breaking it down into smaller chunks if that is going to help with multiple related issues.
by user 259070246382469121
We have quite a few more issues to raise, but Ill do them all separately as they are not all related.
by user 259070246382469121
I’d recommend trying the various mesh compression options (draco, meshopt, or none) before changing the source data
It looks relatively low poly already, so compression may not be needed on that particular mesh.
Did one of the mesh compression options fix this for you?