Co-op Career Season 7 Desync Bug Host stuck in Practice Player2 stuck in HQ

My friend and I are currently in Season 7 of our Two-Player Co-op Career. We have just reached the second Grand Prix of the season (China). When loading into the session, the Host (Player 1) successfully enters the workstation/practice screen. However, Player 2 remains completely stuck in the HQ main menu (R&D / Driver updates screen). Player 2 cannot click on anything, and the game does not advance to the practice session for them. We have tried restarting the game and clearing the cache but the game keeps desynced at this exact point in China, effectively breaking our 7-season-long save game.