We’ve seen this happen intermittently and we are looking at what could be the cause. We need a consistent reproduction of this scenario more than once with steps one can follow, so we can find a fix for it. So far we haven’t been able to do this.
For a quick fix, would you mind taking a full backup of your instance, reinstalling your instance following the standard install and restoring the full backup? That always seems to resolve the issue.
We will keep looking at this though.