Hi,
I'm playing on the ATM9 modpack and I've made a mob farm in the Other dimension as I saw in the config that they should drop only epic and mythic items. This seems to work with gems and boss mobs (the ones that announce and glow) but I've noticed that only boss mobs drop apotheosis affixed gear. Normal mobs seems to have a chance in different dimensions to drop affixed gear, but not here.
I've also see this error in the server console:

This seems to show up when a mob is supposed to spawn with affixed gear, not when they're killed as I first expected.
I looked into the code for placebo and apotheosis but unfortunately I'm not familiar enough with modding to understand what I'm looking at..
The mod jar names are: Apotheosis-1.20.1-7.4.3.jar and Placebo-1.20.1-8.6.2.jar

Not sure if this is fixed in a higher version or not, please let me know if it is!

Thank you!

This is a modpack configuration issue. It means they have created a boss looking for gear sets tagged with the_other, but did not add any gear sets tagged with the_other. You should report it to ATM.

Oh so this has nothing to do with affixed items or apotheosis bosses? Appreciated, I'll report it to them.
--Edit, re-read the response, I believe I understand what is happening now

Hey, sorry to bump this after its closed.

ATM is taking a while to get back to me so I was wondering if this is something I could easily fix on my server directly? If there's no gear sets tagged with the_other, where can I find the config for gear sets so I can do it myself? And if I do manage to fix it, does this need to be fixed on the clients also? I wouldn't expect so but good to check.

Thank you for your time!

Update on this, the gear sets for the other are definitely configured in the pack. Found them at kubejs/data/apotheosis/boss_gear/the_other and we can see that the gear set is tagged with the_other also

diamond.json

netherite.json

ATM has placed their files at kubejs/data/apotheosis/boss_gear/the_other, which is incorrect. The appropriate path is gear_sets (instead of boss_gear).

That worked! I'm pretty sure it didn't resolve my issue which was that non-boss mobs don't seem to be dropping affixed gear in this dimension, but it did solve the console messages and the bosses are exclusively dropping diamond or netherite gear as intended now. Thank you! I've reported it to ATM and will see what they say.

If you have any insight on why normal mobs might not be dropping affixed gear in this dimension, let me know? I'm like 95% sure that normal mobs can drop affixed gear usually, but let me know if I'm mistaken.

Thank you again!