Update: On further experimentation, I can confirm the issue only occurs when viewing a player profile for a player on a club registered to one of the new club continental competitions for North America. Non-registered clubs for that year's competitions can open player profiles just fine. Clearly something is going wrong once a club is registered for the continental competitions that causes the game to be unable to open those profiles, but I can't fathom what that might be - all rules validate just fine and the save doesn't crash on advancing or anything, just when clicking into those profiles. Maybe the game is for some reason looking in an incorrect location for the player profile data when their club is registered to the continental competitions? I have no idea how to verify that though.