Dock doesn't show badge count, if new notifications arrived when screen locked

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

This bug was fixed in the package gnome-shell-extension-ubuntu-dock - 67ubuntu20.04.3

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gnome-shell-extension-ubuntu-dock (67ubuntu20.04.3) focal; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * docking: Don't use non-existent Utils.DisplayWrapper.getWorkspaceManager()
  * dash: Use clutter alignment to ensure we properly arrange the dash
  * metadata: Set extension compatible with shell 3.36 only
  * dash: Sync some more to the upstream cleanups
  * docking: Properly replace default dash in all modes (LP: #1795703,
    LP: #1865865)
  * docking: Delay hide requests if we're currently showing
  * docking: Don't sync overview's iconSize anymore
  * docking: Reset old dash changes if something changes it (LP: #1795703)
  * docking: Cleanup the docks destruction code
  * docking: Use parent vfunc results to get slider container sizes
  * docking: Add mainDock property to DockManager and use it
  * docking: Don't pass allDocks to every child
  * docking: Ignore key-repeat
  * fileManager1API: Use a cancellable to stop proxy creation on destruction
  * dash: Cleanup preferred width/height vfuncs reusing upstream code
  * dash: Get content box from the themeNode
  * dash: Some code cleanups to match Upstream code better
  * appIcons: Redirect events from the showAppIcon toggleButton to the parent
  * general: Don't use Gtk enum definitions for St widgets
  * docking: Apply the height/width dash constraint after adding to main uiGroup
  * docking: Delay toggling to group multiple requests
  * docking: Consider theming when computing the sliderContainer space
  * docking: Reimplement Clutter.BindConstraint to bind to Maximum size only
  * docking: Replace the dashSpacer instance in default controls
  * docking: Make sure we don't send the overview offscreen in extended mode
    (LP: #1834967)
  * launcherAPI: Actually keep track of the unity bus ID and replace it
    (LP: #1756837)

  [ Michele Gaio ]
  * Fix bug with xscreensaver.

  [ Jordan Christiansen ]
  * Update the screenshot to Gnome 3.34

 -- Marco Trevisan (Treviño) <email address hidden> Wed, 18 Mar 2020 03:22:28 +0100

It' is really fixed? Just tested on Ubuntu 20.04 RC, package gnome-shell-extension-ubuntu-dock 67ubuntu20.04.5 and doesn't see any difference. Badges still disappear after screen lock.

Tested with Telegram.
Thunderbird since version 68 (not sure exactly) does not use badges anymore.