The gap also appears at the top of the navigation bar in modal views that have a background color applied. This seems to be the same underlying problem as the landscape issue, but manifesting in a different context. I can also confirm that this is reproducible in the example project linked by the original author. Here is an image illustrating the gap I'm seeing in a modal view:

Just wanted to post an update on this issue. After installing iOS 26 Beta 3, it appears this bug has been fixed.