There is this issue when you try to craft a disc but when you hit the "create" button it just changes it to some another disc and crafts that one instead. (it does not happen in singleplayer) (it creates the same random disc for every player)
Minecraft: 1.16.5
Forge: 36.1.32
Mod version: MCDJ v2.1.1 for 1.16.4 | 370.24 KB | Feb 9, 2021 | 1.16.5
Server hosted by apex hosting.

i noticed this on my server as well. if you search "disc" in creative menu you can find all your music. im planning to use custom npcs to have the discs sold in shops rather than crafted by players with a blank disc