Duplicate unread message notifications between dash and dock

[Jake Hoban]

When there are unread messages in a messaging app (e.g. Mattermost, Telegram, Proton Mail, whatsapp-for-linux - some of these are installed from deb and some from snap) the unread count appears in the dash, but stays after I've read the messages unless I also dismiss it from the Gnome dock notification centre. The only way to stop that behaviour seems to be to set "do not disturb" in Gnome dock but that's not what i want. I want notifications for unread messages, which disappear automatically when I've read them.

Screenshot attached - Mattermost icon in dash shows 3 unread messages, although they have all been read. At the top you see the notification centre where I have to click away the messages to make the count on the icon go down.

Ubuntu 24.04, gnome-shell 46.0-0ubuntu5.1

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: gnome-shell 46.0-0ubuntu5.1
ProcVersionSignature: Ubuntu 6.8.0-36.36-generic 6.8.4
Uname: Linux 6.8.0-36-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 28 13:20:03 2024
DisplayManager: gdm3
InstallationDate: Installed on 2024-05-12 (47 days ago)
InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
RelatedPackageVersions: mutter-common 46.0-1ubuntu9
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to noble on 2024-05-13 (46 days ago)