Hi i'm running the direwolf20 1.12.2 mod pack, i added Tinkers Tool leveling to the server files + twitch.
Started up the server etc etc, but the tools arent getting any xp? There not even showing "Level: Clumsy" once there crafted, but in the UI they do.

And if i start up a single player world it does work. (Yes I added in the mod before starting the server, its was a new world etc)

I did that, when i start it up its reconized, it clearly says Level: Clumsy, but while for example mining with a pickaxe it wont get xp.

Also add the mod to your client, not only the server.

Im having a similar issue on my sevtech server, at first the things were getting xp, but after a bit the xp stat disappeared and the items no longer level up. no idea how we'd fix it

Still not fixed in 2020

This mod has not updated since 2018, we do not need yearly updates saying its still not fixed. Updates saying its not fixed in X version are arguably useful, but if there has been no new build of course this is not fixed.

Still not fixed in 2021 ;/
When crafting in survival, it doesn't show level: Clumsy, but in the JEI list, level shows for all types of tools. And when u trying to get one with level by creative mode, then turn into survival, the XP won't grow up even if u used it for a long time...