Notable changes imho:

* jj arrange command brings up a TUI where you can reorder and abandon revisions. * jj bookmark advance automatically moves bookmarks forward to a target revision […] It is heavily inspired by the longstanding community alias jj tug * jj workspace add now links with relative paths. This enables workspaces to work inside containers or when moved together. Existing workspaces with absolute paths will continue to work as before.

(In my own usage the last item makes it easier to share workspaces with syncthing.)

One hypothesis I can offer is that your car could not, for whatever reason, use assisted gps to download the almanach which relies on mobile networks. Gps devices that download the almanac via gps itself can take up to twelve hours (in higher latitudes i think)!

It doesn't just become invalid; almanac is good enough to use for satnav for over a day.