https://paste.atlauncher.com/view/cba56326-94b7-4b24-a2d4-5639fe2329ca

Where do you get the impression that the crash is caused by chalk? o.O

Critical injection failure: LVT in net/minecraft/class_634::method_11112(Lnet/minecraft/class_2604;)V has incompatible changes at opcode 62 in callback #arcanus:arcanus.mixins.json:client.ClientPlayNetworkHandlerMixin from mod arcanus

Looks like arcanus is the issue

dang, it strangely only happened when chalk was added. - i suppose i have to pick between chalk or magic xD