Minecraft Version
1.20.1

Mod Version
1.48.1 fabric

Describe the bug
The aoe damage caused by the lichblade doesnt count as player damage. This means that anything hit by it or killed only by it; Will not aggro onto the player (ez endermen kill), will not drop exp and (as far as i can tell from very minimal testing) not be effected by looting

To Reproduce
Hold a lichblade.

Thank you for your report!
This should be fixed in the latest version (1.51.5).