Your observation is correct. v7 is literally "day 1" of backup to tape functionality. As with any new functionality, it takes some time to stabilize and catch issues which are impossible to reproduce in testing. Besides, tape is unique in the way that the amount of different tape devices is totally immense (and each device will have its own problems and peculiarities). Vast majority of issues we had to deal with so far were device-specific.
At this point however (as of Patch #3), we are happy with the support load on tape related support cases, and can conclude that the stabilization period is over for the most part. The above is one of two remaining annoying issues that slipped into the latest build, we are planning to address them with the newer Patch #3a build.