Vanilla has the tag powder_snow_walkable_mobs which I think just allows you to add the player to it so I dont think a mixin is even required.

It's used in things like the entity argument to explain what "@s" and "@r" is and then summon for the name of the entities.

Do note as you currently have it, it will crash when on a dedicated server as it doesn’t have access to client classes like Minecraft. To fix/workaround that you’ll want to check if you are on the client, for whatever mod loader you’re using there should be away to find what “side” you are on.

Haii