Hi its me again 😂
Jukebox upgrade stops playing music when you open the backpack with essential installed (hosting a server/playing singleplayer/playing on someone's else host; doesnt matter, music stops)
mod versions:

Fabric 1.20.1 V0.16.10
edit: text makes sense now

same issue here in 1.21.1 version 3.21.1.1.82 fabric api 0.115.1, i have no mods related by @programaus there, only mod menu in common but same behavior when disabled