What I noticed:
-The shine "line" appears with a delay (~1s)
-The line takes another moment before moving
-Both the line and 3d model are very slow (is it intentional?)

All the mods are at their latest version for 1.19.3 Fabric
The game is capped at 60fps with RTSS

Also sometimes the animation never appears, re-opening the inventory makes it come back

Any news?

Interesting, this does look buggy and quite slow. Version 1.4 was supposed to include a fix that would make the animation speed independent of frame rate but perhaps there is a bug. I will look into this and get back to you.

Thank you very much!