I might ignore this and just fill less full, but since the bike is currently torn down and I'm about to put back together I really don't want to do so if I know it's leaking.
I checked the gasket and it seems totally fine.
Any chance the answer here is "this part always leaks if you overfill"? If not, then would I just need to try to replace the gasket or else the whole assembly?
The float just turns a quarter to a lot into place, so I can't really tighten it any further, so that's not an option.