Possible Fixes

Yes

Modpack Version

2.13

What happened?

Started using mekanism covers, getting this error when placing any blocks now (or after 1-2 minutes of gameplay):

Description: Accessing LegacyRandomSource from multiple threads

latest.log

https://gist.github.com/PmanAce/e4104b2b6e74f564bd8b0d0ca8e6ef26

Developer reports

No response

Exact same issue here, here is the crash log:
crash-2025-01-02_12.50.33-client.txt

I've gotten this repeatedly. I'm attaching a zip with multiple crash logs for this crash.
crash-reports.zip