Bug: Desyncs at the Start when selecting cards
Games will desync when: Player A selects a card during any Match Start timings, or at least any timings in which Player B has not yet loaded in.
Example:
- Player A and Player B queue into a match.
- Player A fully loads in and Mulligans, Player B is still loading in.
- Player A waits for Player B's Mulligan to finish however on Player B's side they will see waiting for opponent
Conclusion: If a player processes any effect that needs them to make a choice (Mulligan, Draft, any other selector code) while the other player has not fully loaded in yet, once the latter player finally loads in they will be desynced and the game is locked.
Note: This is using custom Mulligan rules on my end, however I've also experienced desyncs using the AK Template Mulligan.