Folding menus do not work anymore (on Wayland)

[monochromec]

When trying to access any folding menus (eg. in View top-level menu such as Headers, Sort by, Threads, etc.) these menus do not expand any more.

This seems to be bound to Wayland only as it work as expected under X11 using Gnome shell.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: thunderbird 1:78.13.0+build1-0ubuntu0.21.04.2
ProcVersionSignature: Ubuntu 5.11.0-31.33-generic 5.11.22
Uname: Linux 5.11.0-31-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: christoph 6475 F.... pipewire-media-
 /dev/snd/seq: christoph 6474 F.... pipewire
BuildID: 20210802223056
CasperMD5CheckResult: unknown
Channel: Unavailable
CurrentDesktop: GNOME
Date: Wed Sep 1 07:59:50 2021
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2017-08-31 (1461 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-0680c0c5-c5cc-4fcd-8a7f-a4cde0210404
Plugins: Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/thunderbird/omni.ja:greprefs.js:732
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=78.13.0/20210802223056 (In use)
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RunningIncompatibleAddons: False
SourcePackage: thunderbird
SubmittedCrashIDs:
 bp-0680c0c5-c5cc-4fcd-8a7f-a4cde0210404
 bp-8a568d4d-03fa-4892-aa74-169250210331
 bp-a3a6396d-cf62-424a-85dd-3772f0210328
 bp-5c7f6431-4927-4afd-8eca-f673e0210328
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to hirsute on 2021-04-23 (130 days ago)
dmi.bios.date: 06/09/2021
dmi.bios.release: 2.16
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.16.0
dmi.board.name: 0PF86Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.16.0:bd06/09/2021:br2.16:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0PF86Y:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9360
dmi.product.sku: 075B
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.apport.crashdb.conf: [modified]
mtime.conffile..etc.apport.crashdb.conf: 2021-04-25T10:10:15.799073

[monochromec (monochromec)]

This only occurs in the gnome-shell running Wayland, this problem cannot be reproduced in other desktop environments (both running Wayland and X11 including Cinnamon and Plasma).

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.