Yes, you found mine, but we also have in addition to 7020: 7022,3846
Whether or not these are valid, no idea, just offering to help you close those out, especially because I play multiplayer in addition to solo.
I appreciate it.
7020: As I commented last night on the mantis record, this is actually an interface problem: a player can't change from Normal to Helper midgame, the procedure to getting someone in as a Helper is different. So the manage-players interface needs to not let you think that you can make that change (and not try to do it, apparently it was and causing a desync), and the lobby needs to be amended to allow picking role, just haven't gotten there yet.
3646: I tested that one a while ago but I wasn't able to reproduce it from the save provided, despite it being consistent for the players at the time. That probably means that either it had already been fixed or it was related to one or both of the players having "residual" data from a game loaded before they started that one (which is a bug, but hard to find and generally easy to workaround by having everyone do a fresh run of the .exe before starting/loading the MP game).
7022: same as 3646, really.
So if you do find a reproducible case of 3646 or 7022 or any other desync, I'd be delighted to have info on how to reproduce it myself. Or even non-reproducible reports; those aren't generally actionable but it builds up clues.
Personally my guess on 3646/7022 is that it was the same residual-data bug that was fixed since they were first filed. But that's uncharacteristically optimistic of me.