bluetooth coupling is only possible in certain combinations

Initializing a bluetooth coupling on an Android device causes a notification to be displayed in gnome-shell which doesn't display the "confirm" or ~"ignore" buttons. When clicking on the notification (which seems the only intuitive way to make the buttons visible) the notification disappears and apparently selects to ignore the requests implicitly. The user has to guess that.

Initializing the coupling from the Ubuntu side works find because the confirmation has to be performed on the device.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-shell 3.28.2-0ubuntu0.18.04.1
Uname: Linux 4.15.18-041518-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 14 17:23:28 2018
DisplayManager: gdm3
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to bionic on 2018-04-30 (106 days ago)