Here's the crash report

I'm using the [1.16.5] [Forge] Pehkui 2.0.0 version. A few data-packs depend on it to add certain origins. I'm not entirely sure if it's your mod causing it or not, I'm not too good with crash reports.

This looks more like an issue from the mod performant. Try disabling it for testing and check if the bug still occurs.

That did it, my bad. I do seem to have problems with the data-packs after installing Pehkui but I'm not sure if its a problem on my end or not

Fixed with the latest version, cheers

If you have a specific datapack that causes issues, please write attach the datapack with the issue.