No Reliquary loot is dropping from the mobs.
I thought this was do with the lot probability of getting that loot, however on further investigation, Reliquary is checking for "damageType.equals("player")", which I'm using to store my "inSpawner" text.

So I need to rethink "inSpawner" to see if I actually need it and how I should apply it to a FakePlayer.

Reliquary has also pulled its loot handling code and is rewriting it to use the new loot system, removing the need for handling in their mod.

All works fine with Reliquary 1.9.4-1.3.2.390.
However this could still be a valid issue with other mods that check the damageType string.

This is getting fixed. Replacing the damageType custom string with the default "player" and then uses the "instanceof DamageSourceWoot" to determine that it is one of my spawner kills.

This now works with the older version of Reliquary 1.9.4-1.3.2.372, which is before they moved to using vanilla loot tables.