This is the part that bothers me (not that you got it fixed, that's good for you)
But that there are dealerships replacing the parts and/or saying "it's not cracked enough."
First off there is no part number referenced for the new dashboards yet, so how are you getting the updated component in your vehicle?
Second there's no TSB to provide inspection criteria, new part number, warranty labor op code, no specific vehicle identification instructions, ect. for the dealership to reference to correct your issue; so how they decided what the new part number is, what type of crack is acceptable, how big of a crack is acceptable, how much stickiness, ect. is anyone's guess.
Basically the dealership you got your dash from just about violated every requirement by Toyota for warranty AND we don't even know IF you got the updated part or they just happened to have one lying around (that could or couldn't be the new part.) This is the type of stuff that can cause issues for everyone.