Exported model from SpeedTree have weird UV issue

Does anyone know why this happens?

SpeedTreeScruggers

Hello,

We are aware of this problem. A few malformed UVs can show up on some game FBX exports (not VFX FBX exports).

We will have a fix for this shortly, but in the meantime you can disable “Use multiple processors” in the application preferences to work around it. If you find this degrades performance elsewhere, it only really needs to be disabled at export time.

Sorry for any inconvenience

Thank you so much for the reply<3 . I will try that

Yes it worked, Thank you again