When exporting static meshes with bExportSourceMesh enabled, there is a problem where all UVs are fragmented.

Hello,

This is a bug. Sorry for the inconvenience.

It looks like you are the first to report this issue.

I opened a bug that we will look into in a future release. Here is a link to the bug: UE-330931.

Note that it may take a couple of days before the link becomes operational.

Thanks for your patience.

Regards,

Jean-Luc