It sounds a little strange, I can't stop thinking that with Chelsea's current management, this team needs to improve much better but they seem very selfish.
If Chelsea don't let go of Mason Mount, it's precisely this team that will lose a lot and Mason Mount will leave freely next season while Mason Mount is also no longer wanted by the team.
The price of € 60.00 million - € 65.00 million is indeed very expensive for a player who doesn't develop with the Chelsea team, so it's only natural that Man United offers below that price.
Yes, it's true that this is a bit unreasonable, Chelsea should be able to take advantage of this opportunity to sell him, because if he doesn't sell him now, then most likely the Blues will be forced to let him go for free. Of course, Todd didn't want that to happen in the midst of the problems that hit his club. The management must be able to think again, by selling it now at least get additional money for capital in the upcoming transfer market even though the nominal is not in accordance with Chelsea's provisions. However, I've heard that Mason Mount does not want to stay at Chelsea any longer and has so far rejected any contract extensions that have been offered. With all his statements it is clear that the best solution is for Chelsea to let him go now if they don't want to miss out on his departure as a free agent.