The issue at hand here is that Chelsea offered him a contract before the world cup and then pulled it away from him when he returned from Qatar. I read somewhere that Mount was negotiating directly with Boehly and the new deal was verbally agreed set to be signed after the world cup, but then Chelsea appointed 2 new sporting directors who were tasked with handling contacts and they supposedly took the offer away and offered him a different one more in line with the incentivised guys like Mudryk, Enzo and Badiashile signed. Mount rejected it and as has been reported in several places, there actually hasn't been another offer put on the table for him since then, except a silly 1 year deal (which I guess was a misguided attempt to give both sides more time to hash out of suitable agreement) that he also rejected.