So, in creative mode if i summon a eldritch (any tier) loot drops.

in survival, if I summon anything and kill them, no loot drops.

I tried vanilla mobs, and custom mobs.

this happens for me as well, though its not specific to creative/summoning, it just happens randomly and only with the eldritch tier

Hopefully, I fixed this in the latest release. Open up the issue again if it isn't fixed.