Mixins to ServerPlayerInteractionManager and ClientPlayerInteractionManager attempt to set a TypedActionResult as the return value of methods that return an ActionResult.
Mixin does not report that error, but the game crashes with a ClassCastException whenever a mod registers a callback that returns a result other than PASS.
https://gist.github.com/Pyrofab/1cf5149616504ddb91ab3fc854dd4bbc

Thanks, fixed by #484