The katana after being sheathed will appear outside of its sheath while climbing vines and such, and immediately appear back in its sheath after landing on the ground.

epic fight version, minecraft version, forge version, please provide some kind of footage (image, video, etc)

Epic Fight: 18.2.6
Minecraft: 1.18.2
Forge: 40.1.68

please make sure this hasn't been fixed on latest version

This is not a bug but where can be enhanced in terms of animation.