What version are you seeing the problem on?

1.18.2

Describe the issue

1. Make a key
2. Pair it to a lock
3. Store key on keyring (and name it outside of an anvil)

latest.log

No crash, no log.

My mind is blown, suppose this was on the modpage or something. I didn't read it :D

Already in the mod, right click with a key on another key like you'd do with a bundle, or craft them together.