Hey, I'm wondering if this is a Pehkui error or an error that is with Slime Origins. If you died with the slime origins mod and Pehkui, it crashes and spits out, "Error: java.lang.IllegalAccessError: tried to access field virtuoel.pehkui.api.PehkuiConfig.DATA from class net.minecraft.class_1309". This happens every single time and is easily replicable. Is there any fix for this? Here is a copy of my log.
crash-2021-04-28_19.25.23-server.txt

This is a Slime Origin issue (Jack-Sibley/slimeorigin#5). They'll need to update the mod to use the new APIs that are in Pehkui versions 2.0.0 and newer.