While playing FC Mobile, I cancelled matchmaking right after the Cancel Matchmaking button appeared and was returned to the home screen as expected. However, when I tried to start matchmaking again, the game said I was already in a match, even though I was on the home screen and could freely navigate through all menus.
It appears that the match continued on the server side after cancellation. I was never placed into the match or given a way to reconnect, and when it ended, I was automatically given a loss, causing an unfair rank drop. This can be extremely frustrating for higher ranked players as it wastes hard earned progress.
I experienced this issue in both VS Attack and Head to Head modes.