Did you check the selection with the Quick Mask and/or the selection editor?
Can you share one of the problem XCF (dropbox/googledrive if >2MB, + link in PM if private).
I assume of course that this is not the problem of 45° selection borders that are invisible due to the way the marching ants are created.
Can you share one of the problem XCF (dropbox/googledrive if >2MB, + link in PM if private).
I assume of course that this is not the problem of 45° selection borders that are invisible due to the way the marching ants are created.