I had the same issue when I was using (yet-another-config-lib-fabric-3.2.1+1.20 + Zoomify-2.13.5+1.20.1).
Fixed it just by updating to a newer version: (YetAnotherConfigLib-3.5.0+1.20.1-fabric + Zoomify-2.14.0+1.20.1).
p.s. just in case u will need it I'm using modmenu-7.2.2
