[tbb-dev] MacOS DMGs result in "no mountable file system" error message

Hi, on my MacOS 10.12.5, both the stable 7.0.2 and the unstable 7.5a1 of the Tor Browser Bunde's DMG files, unlike all other (non-Tor) DMG files I come across, can't be mounted by the system's own DiskImageMounter. Trying to do so gives a "no mountable file system" error message. When extracting the included TorBrowser.app with BetterZip, the resulting file can't be run. Cheers, J.