As per discovery by build testers, a massive memory leak was discovered if one attempts to give themselves the fortune to drop an item via commands.

Said leak causes massive TPS lag upon happening.

https://github.com/Um-Mitternacht/Bewitchment/blob/1.12.2/src/main/java/com/bewitchment/common/fortune/FortuneDropItem.java

This is the fortune blamed.

Staff, check the feedback channel on discord on how to replicate it yourself.