I just tested in version 3.7 and see what Chrisy sees, that the duplicate barcode is now being recognized in both the circulation menu and the bib holding menu. So, it appears this bug is fixed.
I also went back to a version 3.5 client, and I was able to recreate the bug as Jennifer describes.
So, confirming that I see the bug in version 3.5 and noting that the bug no longer appears to be in version 3.7.
I just tested in version 3.7 and see what Chrisy sees, that the duplicate barcode is now being recognized in both the circulation menu and the bib holding menu. So, it appears this bug is fixed.
I also went back to a version 3.5 client, and I was able to recreate the bug as Jennifer describes.
So, confirming that I see the bug in version 3.5 and noting that the bug no longer appears to be in version 3.7.