According to French journalist Hadrien Grenier, Paris tried to renew Mbappe for a short time, regardless of the cost, and did not want the players to move freely.
Paris Saint-Germain is trying to extend Mbappe's contract for a short period of time, no matter what the cost. Negotiations are ongoing. The players have already made the decision to join Real Madrid. But Paris don't want to give up any possibility of avoiding his free transfer.