I have a similar issue with gold hands, but the crash looks different
"Cannot invoke "net.minecraft.class_1657.method_31548()" because "player" is null"
https://pastebin.pl/view/d4bd99b5

Originally posted by @Sebas-Re in #7 (comment)

This is caused by com.simibubi.create.content.curiosities.symmetry.SymmetryHandler.onBlockPlaced(SymmetryHandler.java:57) whatever that is

Ooohhh ok thanks you! So weird that thing corrupted the poor hand

Ooohhh ok thanks you! So weird that thing corrupted the poor hand

What is that mod, by the way?

It's Create. Very likely the wand of symmetry, although the player that reported this on our discord said they don't have it so not sure why is doing it, I'll have to ask Create Devs about it

Fixed as of Create#410

Fabricators-of-Create/Create#410 (comment)

They won't be fixing it. You have to either drop my mod or theirs. I understand if you choose mine.