The Item that is in the golden hopper filter slot is removed when you
log out of Single player. 1.18 Fabric

Hoppers need to be setup every time that you log into the game

Version 1.2.0 has been released, which properly supports Minecraft 1.18.

It looks like the version of Golden Hoppers compatible with 1.17 silently breaks in 1.18. This is because a method signature changed, meaning the filter serialization is never called. Fortunately, 44af0d3 already fixes this.