It's happened to me twice. Ford opened a case and stated that they would look into it. Nothing from Ford as of yet. What I did that cleared this up was, both times I was listening to satellite radio. If you switch from satellite to either FM or AM radio and back to satellite the noise...
I have a 2.5" level upfront and a 3" block on the rear on my 2022 F150 Platinum. Standard garage and no issues whatsoever and still have at least 2 more inches of clearance. BTW, I also have 295/70/18 wheels/tires too.
No issues at all going from a 20" to a 18" wheel. As long as you stay as near or positive offset wheels. The more negative offset, the more trimming you'll need to do.