After first death, there is bunch of weird behavior from solcarrot mechanics:

1. If i continue consume food, messages "You gained heart" appear, but without sound, and no actual hearts gained
2. /foodlist size and book show different values of eaten food and gained hearts. Also, /foodlist size stops updating when eating new food Video
3. After /foodlist sync eaten food count drops somewhere back, but when i eat new food, its jump way forward again and repeating Video
4. In multiplayer particle effects of gaining new hearts appears somewhere else (i found them over my bed sometimes)

Whole situation leads to unable get new hearts in modpack.

MC version: 1.12.2
Solcarrot version: 1.8.3
Modpack: Enigmatica2Expert 1.80

latest.log
debug.log

Does this still happen with just SoL: Carrot? If not (which is likely), can you try it with less and less mods until you find the smallest combination of mods that is sufficient to cause this issue?

Ok, I will try one day...

_{^{Finnaly, after 25 days of dely, and ~4 hours of messing with 250 mods and i found it...}}
Mod causing issue - Hunger Persistence
Tested on minimal composition:

• AppleCore-mc1.12.2-3.2.0
• HungerPersistence-mc1.12-1.0.1
• solcarrot-1.12.2-1.8.3

Experienced all things described in op post.

Hunger Persistence not updated since 2017. So probably this new behiviour caused by updates of SolCarrot (about half of year ago everything with food was fine).