Since Fisk implements IOffhandRender for its suit rendering, the Backhand mixin's injected method is expected — but Fisk was never written to be compatible with Backhand's specific mixin-based API ...

Players on the Isle of Berk modpack (and any other 1.18.2 pack shipping off_the_grid-1.6.0-forge-1.18.2.jar) experience a hard crash every time a brewing stand ticks ...