Honestly, I didn't watch this match, but if I refer to the match statistics. Apart from PSG controlling ball possession, they also had lots of opportunities. tactically, PSG played much better. The performance of the PSG players in this match did not play badly. in fact, they attempted 21 total shots. 10 of them, on target, 5 big chances. but for some reason, they were unable to take advantage of every opportunity they had in the match against Clermont.

On the other hand, Clermont is a team that is in shambles. In their 6 matches just before hosting PSG, they won not a single match. but they had one draw against Toulouse. In the match against PSG, Clermont tended to play a little deeper, aka defensive.  There's nothing wrong with that, it's only natural because the team they are playing against is a tough squad. game-wise, they only play pragmatically even with long balls.
one thing that was the difference in this match, so that the match ended with a draw. Clermont goalkeeper, Mory Diaw, saved his team. His performance was brilliant, making 10 saves. 7 saves in the penalty box.

So, it doesn't seem like PSG is playing badly.  but because they are unlucky, they cannot take advantage of every opportunity they have. Well, in football it is unique because it cannot be predicted accurately. Even a team, no matter how strong, has the potential to experience defeat or a draw.