I'm assuming it's related to the new ability to edit trinkets in creative inventory
Log:

https://www.toptal.com/developers/hastebin/emuyupejoc.yaml

Another example of this https://paste.corebot.dev/siyevosiru.php

I've had this same issue. #153

I don't have any datapacks that touch the slots, though.

Hm. And another difference is that mine always crashes with the slot datapack.