[2023] New player in countdown during setup messes up management if other player joins

When I set up a countdown, and select a player (player A) in order to manage them (move to different slot, kick, make leader etc), and during that a new player (player B) joins the countdown, suddenly player B is selected. This can lead to the situation that I accidentally do something to player B that I intended to do to player A.

Expected behavior: When I select player A, and player B joins, player A stays selected.
Related expected behavior: When I select player A, and they leave, the menu goes back to the state that no player is selected.