Could someone else confirm this?

I just went through the steps you outlined, and did not get the same results.

There were two differences in my setup, however: (1) I was on home power; and (2) as a result did not have to re-select visual mode.

I did get the return to the FlanceDoor visual on powerup just as you did; however, at the end of the timeout period the visual advanced to the next in line.

I am quite certain that in-car my visuals do continue to change on timeout after rebooting.

tanstaafl.