Bug description
A description of what you expected to happen and what actually happened.
Game crash at startup

Game log:
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https://hastebin.com/share/utuforazen.yaml

This crash is really annoying. I saw on the issue page for First-Person Model mod the author mentioned: "Opening the identity jar, then editing identity.mixins.json and removing the line ShadowMixin does fix it." though when I tried this it somehow deleted the whole jar. It would be nice if these mod devs could come up with a solution, as the First-Person Model mod is a very good client-side mod and Identity is needed server-side and client-side for multiplayer modded servers with it.