Good catch by @LexB It is definitely the Auto-Vignetting correction causing the problem. Interestingly, you can turn off Auto-vignetting and correct manually and the pattern disappears. This is a workaround and you should still report the issue.
Good catch by @LexB It is definitely the Auto-Vignetting correction causing the problem. Interestingly, you can turn off Auto-vignetting and correct manually and the pattern disappears. This is a workaround and you should still report the issue.