A licensee has reported that Full Screen native resolution does not work properly on the iPad Pro 11-inch and on the iPad Pro 12.9-inch (3rd generation). Black borders are used around the screen instead of using the whole screen.
Regression?: No Yes
This occurs in 4.19 and 4.20 Fixed in 4.21 and reoccurring in 4.22
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-66627 in the post.