The dealer SHOULD NOT up your cost, or lower your trade.. As long as you have it all in writing your fine.
Heck, back in 2019 I ordered my F-150 Lariat as my work truck 3 months before my lease was up. The lease expired and still no truck... I extended the lease twice with no truck...
Finally the dealer received word that the truck had been damaged in transport and was "unsellable" . I had an option, re order and extend the lease again, or take something off the lot.. All he had was a platinum with many additional options that I did not order.... HE gave me that truck for the same payments as the Lariat...
If your dealer is good, they will stand behind everything