You are missing the point here. As was explained before, you should consider “Bugfix only” branch as stable. “Current” is where new features are added first, and (since new features often break existing features in some way) is not initially considered stable.
It is rather good Mikrotik now provides an easy way to switch between bugfix (stable) and current. Whether it should or should not allow redownloading/reinstalling the version that is currently installed on your device, is arguable. I’d rather leave it as it is now.