Signal for example handles this situation a little better.
New message arrives, system notification is sent, badge with number is
displayed on Signal icon on the Dock. Opening Signal and reading new message
removes also the system notification, therefore updating the icon count on the
Dock.
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This problem remains in Ubuntu 24.04.
--
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https://bugs.launchpad.net/bugs/2015674
Title:
Unread mail notifications do not update
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