Well when i kill pig i get pig meat, and chicken leather, when i get meat and no leather,
https://gist.github.com/HugsLibRecordKeeper/a9a0d2cdc01a9d1bd37c5900e4b55b74
It showed in 270 line
Youre running mods and they arent up to date or have errors, try again with vanilla and i doubt youll have an issue. Moving to mod bugs for now.