I uploaded my single player world file in realms and the custom loot tables are not working. For example, I have loot tables for hostile mobs to drop gold nuggets when killed by a player. The loot tables work in version 1.9 on the single player world which I uploaded to the realm, but they do not work when playing on the realm itself.

To replicate: Create a custom loot json file. Play on the world in single player and observe the loot dropping. Upload the same world to realms and kill some mobs, the loot tables will be the default Minecraft tables.