Overheat when playing multiplayer offline

I am experiencing a bug/issue when playing offline multiplayer with my friend on my PS5 Slim. After around 5 matches, a notification appears saying that the console is overheating, and the fan starts working much harder. However, when I play alone online or in Pro Clubs, even for long sessions (up to 4 hours), I never receive any overheating notification.

I am not sure whether this is a bug or something else, but I would like this issue to be optimized/fixed.