Weird texture issue in palace on mirage

[DeformedSAS]

Your system information

• System information from steam (Steam -> Help -> System Information) in a gist:
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

There is a random texture that seems to not follow the lighting... my guess is that something in hammer5 causes the map when compiled to not calculate lighting for that spot. Same thing applies for linux, so it's not a windows issue.