And that was the first time Vim ever crashed on me:

Vim: Caught deadly signal SEGV
Vim: preserving files...
Vim: Finished.
Segmentation fault (core dumped)

I was using Ctrl+P to scroll through the completion list. 🤔 Reproducible. Ctrl+N still works.

Hopefully fixed by this: https://github.com/vim/vim/commit/8d0bb6dc9f2e5d94ebb59671d592c1b7fa325ca6