It appears that developers did not like the idea of saving multiplayer matches to resume games in the future, since the existing threads about that have been closed/locked:
However, since both threads are from 2017, we can’t assume they have the same posture as four years ago. Maybe there’s hope for this to be addressed in 2021 or beyond.
If an opponent crashes, the game should automatically pause for a 5-10 minute window to allow a player to restart the game and hop back in - once back in all players should receive a prompt asking if they are ready and say ‘such and such player has returned’. - once all press yes, the game starts as per normal - in ranked elo loss or gain won’t be counted until the game is over or a player fails to return - in a ranked team game this has to be refined to prevent abuse