I use Open Loader to change the LootTable of the Drowned Mob to drop Copper from Thermal instead of Gold Ingots but JER still shows that they only drop Gold.

Using:
Minecraft 1.16.5
Forge 36.0.24
OpenLoader-1.16.5-9.0.2
JustEnoughResources-1.16.4-0.12.0.107

Yeah, this has been a struggle point and related to #107 and #120

@way2muchnoise Possibly just ne manual configuration?
That my for who has a json in which you simply overwrite individual entities