thunderbird window hided and abnormal context menu

[J-Paul BERARD]

Many times, when I minimize the main Thunderbird window to the dock, later, it's impossible to maximise it again (impossible to see it) and the contextual menu of the Thunderbird icon in the dock, appears on the top left of the screen like frozen : you can do nothing with it and you cannot hide it until you close the session.
I join a screenshot

Ubuntu 21.04 WAYLAND (64 bits)
Thunderbird 78.11

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: thunderbird 1:78.11.0+build1-0ubuntu0.21.04.2
ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21
Uname: Linux 5.11.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
BuildID: 20210528153351
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 15 15:42:15 2021
IncompatibleExtensions:
 Lightning - {e2fda1a4-762b-4020-b5ad-a41df1933103}
 Français Language Pack - <email address hidden>
 English (GB) Language Pack - <email address hidden>
 Thunderbird (default) - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2020-04-10 (461 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:732
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=78.11.0/20210528153351 (In use)
SourcePackage: thunderbird
UpgradeStatus: Upgraded to hirsute on 2021-04-26 (79 days ago)

[Matthieu Baerts (matttbe)]

Hi Jean-Paul,

It looks like this issue is similar to bug 1932328.
May you check this please? If yes, please mark it as duplicated.

Cheers,
Matt

[J-Paul BERARD (arverne)]

Thanks !
Yes, I think so : probably same issue.