request for temporary workaround: StartupNotify=false
Currently the Manjaro-Deepin like other Arch-based editions face the problem that apparently pamac's
startup notification completed is not being respected because the application doesn't actually open an independent window as described in more detail here
If there's no immediate need for pamac to use
StartupNotify=true, would it maybe be an option for you to temporarily change the line in pamac-tray.desktop?
Like this I would be able to finally release Manjaro-Deepin 17.0.1 without this quite annoying bug.
Thanks a lot