I Upgrade a constructor at a shipyard to a colony ship (3 of them actually from the Pragmatic trait). Next turn I select one to launch set the slider to 0.5 pop then decide I do not want to launch so click cancel. Then launch all 3 at the same time with pop 1.5 (0.5 on each). This is what happens:-
^^ Patch 1.7. I moved the Shipyard 1 hex to the left to get a clearer view. Can reproduce it:-
^^ Patch 1.71. Again I moved the Shipyard 1 hex to the left for better viewing. That Move arrow or exit arrow? Stays untill I reload the game.