Using Geckolib fabric 1.20.1 - 4.2.3 with Connector-1.0.0-beta.13+1.20.1-full and soulslike-weaponry-0.9.9.6-patch-2-1.20-fabric renders some forge mod items invisible.

Mods affected are: Alex mobs (needs geckolib forge), Twilight forest (breaks with optifine, not using it but maybe is related), Ad Astra (breaks with optifine, not using it but maybe is related) and Sword in the stone.

Geckolib is incompatible with Connector currently