mezz/JustEnoughItems#3859 Please see my initial report in JEIs Github.

Also when removing one of the listed mods, but adding a new slot like e.g. belt to the datapack of one of the other mods it crashes again.

I can avoid the crash if I use the accessoires mod and their compatibility patch for trinkets.
So should be an issue with trinkets or JEI or both

No issue at all if I use trinkets + accessoires and this one https://www.curseforge.com/minecraft/mc-mods/accessories-tc-layer