I’m not sure if it’s a typo, but you don’t need to edit and then new, you can just new. It’s a good habit to get into as a replacement for checking something out.

I’m not sure what happened in your conflict situation either, that does sound frustrating. EDIT: Oh, I wonder if it was this: https://jj-vcs.github.io/jj/latest/technical/concurrency/ specifically, that I bet the repo was being modified concurrently, and so you ended up with a divergent change.