Error with MMOItems in a mob's droptable

Summary

Using mmoitem in a mob droptable causes error which the item won't drop

Steps to reproduce

I have these latest dev build: MythicMobs#3439, MMOCore-1.4.4, MMOItems#500, MMOLib1.2.10 installed and no other plugins Running on Paper1.16.1(paper-137)

I added a line (- mmoitems{type=sword;id=cutlass} 1 1) in the example mob SkeletonKing: https://pastebin.com/vgJrpstX (The error occurs with other mobs too, this is just for demonstration)

When SkeletonKing is summoned via command and killed by player, the error occurs.

Current behavior

All items in the droptable can't be dropped when mob is killed, including vanilla items

Intended correct behavior

The items should be dropped as intended

Server log file

https://pastebin.com/iyDf90DK

Debug log snippet

https://pastebin.com/cnEYvgHs

Proposed fixes

I tried removing mmocore but that didn't seem to be the case. Please let me know if more information is needed to help fix this. Thank you

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