Verified in Satellite 6.3 Snap 22.
With mstead's help, we created a 6.2.8 satellite and restored the reproducer db on it.
Then ran the script mentioned in comment 6 and captured the output in before.txt (attached).
After that, I verified that we were in the correct state by attempting to import a manifest, which failed with the desired error (see attached screenshot).
Next was an upgrade straight from 6.2.8 to the latest 6.3 snap, which went smoothly (see attached upgrade log).
After cleaning up an old default capsule, and incorrect repositories, I was then able to successfully import my manifest (see attached screenshot).
Finally, I re-ran the script from comment #6 and captured the output in after.txt (attached). Everything looks great.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA.
For information on the advisory, and where to find the updated files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2018:0336