I left a game and got the experience for it, then I joined a game that had just ended and still received experience as if I played in that game.
Your picture uploading button doesn’t seem to work, so the best I know to do is give you Discord links to my pictures which were originally in a video.
First Match ended, received experience
Me typing in chat, saying I joined right when the game ended
Receiving xp. for ended game (winning player in chat for proof)