Dear Maintainter,
I tried to log into a different session, through GDM3, when logged out. It
works either way round, but for example I had just been logged on with 'gnome'
session and want to log in with 'kde plasma desktop' as the session. This is
done by clicking where it says session below the password input and selecting a
different one. After selecting kde, I then accidentally put in the wrong
password. It tells me 'Authentication Failure' as expected, and then allows me
to re-type my password, but meanwhile reset my chosen session to gnome. This
meant that I ended up logging into gnome and had to log back out again and log
back in (or, if I remembered, change it back to kde after the failure). This is
slightly annoying, and should not be the case, especially as it remembers your
last chosen session across logins.
Ideally, it would remember what you had chosen last and not reset it until you
manually reset it.