Ore only dropping gems about 50% of the time

Note that this is a cross-mod block, where it drops items from the other mod.

The ore block that I made works perfectly fine when I change the drop to a vanilla item, but when I try to change the vanilla item into an item from another mod, it only works half the time.

https://pastebin.com/raw/FvmUPXxU

This is the code for the loot table. The only thing I changed was minecraft:emerald => easy_emerald:ruby. The ore does work with the modded rubies, but they only drop about half the time.