Drills breaks when its energy runs out if used with Ore Excavation or FTB Ultimine.
Just like a vanilla tool, it disappears when it runs out of energy.

mod version?

actuallyadditions-1.3.8+mc1.21.1

Thats been fixed already in 1.3.9

Duplicate with #1432

This still happens on Enigmatica 10 with 1.3.9, so maybe there's a mod interaction issue happening or something. I can reproduce it consistently in survival with a drill that is barely charged through the energizer.

If you break blocks with ultimine and a non tool item like a stick, does it break the stick? maybe its punishment lol

Feels like some mod is trying to hurt the item which is funky

I added explicit unbreakable to the drill in 1.3.11, if it still breaks at that point, id blame the other mods lol.