One of our customers is using VBR v11 Enterprise Edition and had 3 active extents in an SOBR. After adding a fourth active extent backups started to fail due to the following limitation:

At first I didn’t understand how this configuration could have worked because I was looking at the v12 documentation instead of the v11 version. And the v12 documentation states that you can only have 2 active extents:

It was easy to get the backups running again by removing the fourth active extent, but…. What will happen if we upgrade from v11 to v12? I would expect that backups will start failing immediately due to the limitation mentioned above?!
I checked the release notes but I cannot find anything about this. Is there anyone out there that ran into the same issue or knows what will happen if I was to perform the upgrade to v12?
Regards,
Sven