Bug 2021 LTS dedicated linux server bug

Hey all, im currently making a game using FishNet and hosting the server on PlayFlow. The latest 2021.3.21 LTS seems to break the linux server build (UPDATE: also break on the windows server build). The server does not start and throws a new fatal error:

Ive tried a bunch of troubleshooting and the only two solutions that worked were: 1) building a localhost windows server, and 2) downgrading back to 2021.3.19

If theres anything else I can try or if more context is needed, please let me know, otherwise i guess i will stick to an earlier version until this is fixed.

Unfortunate, because i really needed that tile palette optimization!

 

still occuring on 2021.3.22. i submitted a bug report: IN-38256
everything still works just fine in .19