The reason why Chelsea is reluctant to sign Garnacho from my observation is because they were considering any other options, Garnacho isn't the most preferred winger they want at the moment. If their scout can present other good options they might avoid signing Garnacho. Few weeks ago, Chelsea had eyes on Simons, but that deal look impossible. Imagine it was Rodrygo who was open to the sales, trust me many clubs would've bought him since the window opened.
Chelsea is interested in accommodating Alejandro Garnacho and has even made a personal agreement but Chelsea is temporarily delaying recruiting this player because they are waiting for Manchester United to reduce the transfer value of this player and if Man United does not reduce the transfer value according to Chelsea's wishes then this transfer will be canceled, Manchester United should give in a little because after all Alejandro Garnacho is not a player who is of interest to many clubs and they should be grateful because Chelsea is willing to buy him even though it is quite cheap for a young player but I think this is in accordance with his performance which is not yet optimal.