Bug Description:

The first advancement shows the name of the localization file rather than a description of the advancement.

How To Reproduce the Bug:

1. Press 'L' to view advancements
2. Go to The Undergarden tab
3. Hover over first advancement
4. Read description of advancement

Screenshots

Additional context:

Forge 1.16.5 - 36.1.1
The Undergarden 1.16.5-0.4.5
Better Advancements 1.16.5-0.1.0.105 is also installed

I guess I'll have to fix it with a data pack then.

This is actually happening because your translate key in the advancement description field
is blank. It's easily fixed by adding a translation key and then leaving the key's entry blank in the mod's lang file. Alternately, remove the "translate" tag and set the description with a blank string.

Result, even with "conflicting" mod:

What a lame ass response for a lame ass person.

What translation key, is that mod adding an arbitrary key that doesnt exist in vanilla? How is any mod supposed to be aware of this. Next time instead of being a dick put some effort into being useful.

If this is a vanilla key, then the mod is breaking vanilla behavior. Again not a UG problem.

just tested with all the same versions and it doesn't happen. it's some other mod.