Its listed as NeoForge only and not both. which makes launchers decide to install the previous version (if on forge)
And the previous update has the vethea bug.

mc 1.20.1 forge 47.3.0
simple fix: make the last 1.20.1 file forge and neoforge compatible. They both work

Okay. My point still stands about compatibility.
Leading existing forge users on 1.20.1 to be stuck with a 'broken' update is wild.
Only fix is disabling some option in the config which is what the neoforge update only did.

It works on older forge versions, thats the real issue

We dont support forge anymore