[Bug 1964036] [NEW] Firefox icon missing from panel following Kubuntu upgrade 20.04->22.04

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Matthieu Clemenceau (mclemenceau):

1) lsb_release -rd

Description:    Ubuntu Jammy Jellyfish (development branch)
Release:        22.04
(Kubuntu Jammy live session in QEMU VM)

2) apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:22.04.6

3) expected

(upgrade from Kubuntu 20.04.3 -> 22.04. Reboot.)

* Firefox icon on panel to be intact.
* Clicked icon launches browser.
* Icon tooltip/mouse hover to describe application.

4) happened instead

* Icon is missing/replaced with a generic icon
* Icon click produces error notification "Plasma Workspace - preferred://browser"
* Icon tooltip/mouse hover appears, though is blank.

Additional info:
* firefox is still installed, works as expected.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu78
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: KDE
DistroRelease: Ubuntu 22.04
InstallationDate: Installed on 2022-03-07 (2 days ago)
InstallationMedia: Kubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819.1)
Package: ubuntu-release-upgrader (not installed)
ProcVersionSignature: Ubuntu 5.15.0-18.18-generic 5.15.12
Tags:  jammy dist-upgrade
Uname: Linux 5.15.0-18-generic x86_64
UpgradeStatus: Upgraded to jammy on 2022-03-07 (2 days ago)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting
_MarkForUpload: True

** Affects: firefox (Ubuntu)
     Importance: Undecided
     Assignee: Olivier Tilloy (osomon)
         Status: Confirmed

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected dist-upgrade foundations-triage-discuss iso-testing jammy kubuntu rls-jj-incoming
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Firefox icon missing from panel following Kubuntu upgrade 20.04->22.04
https://bugs.launchpad.net/bugs/1964036
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