I'm sorry, I don't have a save file to attach for it.
But the cheesing is to accept a deal lower than the release clause, which then allows you to cancel the deal after a contract gets accepted by the player.
So: player A has release clause of 100 million, team A triggers the clause. You, as the manager, mass offer the player out for less money, accept every offer that doesn't trigger the clause. Then IF player A picks one of the multiple teams that didn't trigger the clause, you can cancel out the deal.
AI should probably realize that if this happens, they can trigger the clause and you as the player can't BS them again with cancelling.
Makes the AI look stupid and breaks immersion. Imagine PSG office being "aw shucks, they just cancelled our offer which was 250k below the players release clause. Welp, we won't put another offer in."