I've tried the latest beta and alpha for forge 1.19.2 but neither show the any drops beside the vanilla ones.
I've tried Aquamire and Alex's Mobs on their own and it showed no loot but on singleplayer all was fine.
I'm using forge 43.2.2 for both client and server.

Updated server and client to JustEnoughResources-1.19.2-1.2.2.200.jar, and now on top of modded mobs not showing vanilla mobs no longer show on server