If I may give my opinion on this matter, let me share you what happened to me a while ago. I was participating on the Istarune/Novablue 'Gold' launch tournament back in the day and it was set to be a double elimination, bo3 format tournament. The timelines were pretty strict and casting/moderation was done via stream.
During a game I had on the semi-finals of the losers bracket I was playing biosol against someone playing 3fd. Our game was tied and on the deciding match a desync happened and everything in the game started to break. Characters didn't die in my opponent side, weird interactions happened and finally my opponent crashed completely, but the game finished on my end with my win. I didn't take a screenshot of the last turn board because I had no idea he crashed and it was a clear win on my end, but the opponent requested a rematch on the stream. Since I didn't take a screenshot and it was indeed a desync, I agreed on the rematch.
We then had a rematch, where I won 2-0 and took a screenshot of both the end turn state and the victory screen. However, my opponent forced a disconnect in the last turn and claimed on stream it was desync again. Even with the screenshots showing a rather dominant board on my side and people analysing possible comeback plays from the 3fd, Ista/Nova wanted us to rematch until we got a clear result.
The problem is that the tourney was going on for a long time already (bo3 format with double elim does that) and everyone on the round was waiting for our match to go on. Since I needed to study for some exams and couldn't really be bothered to deal with the guy again, I simply gave him the match and put an end to that.
My point is, I highly agree with Ori here. Specially with new stakes coming to tournaments in the future and since this is still a major
bug of the game, there MUST BE clear/definitive rules on desyncs
so tourney mods can act accordingly and refer to them in case any of this happens. I really don't care if the rulings hurt someone's feelings if all of this mess can be avoided.
When the prizes get more real and "dishonorable" players play to win the big prizes, you have to make the tough decisions to just DQ both players, especially when there's no spectator mode. You can't play favoritism when you are a judge in these tournaments.
This pretty much sums it up for me.