I will confirm that the fixed that Gnome extension mentioned in comment
#5 did restore the icons (and places them in the centre) for me although
this is not an ideal fix.
Removing/disabling this extension will cause the icons to vanish again.
You can see in the icons there that I have Steam and
Public bug reported:
I have lost the icons that appear in the top right corner of the
Activities bar unexpectedly. I'm not entirely sure what happened other
than the fact that I recently tested some fixes related to bug #1897224
and Groovy Proposed.
ProblemType: Bug
DistroRelease: Ubuntu 20.10
Scratch #38. It needed a reboot and now everything works fine.
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https://bugs.launchpad.net/bugs/1897224
Title:
Graphical snaps can't run in Gnome 3.38 Wayland
I installed the Groovy-proposed updates, including:
Package mutter:
p A 3.38.1-1ubuntu1 groovy500
i A 3.38.1-2ubuntu1 100
Running a Snap results in the same