GNOME 42: org.gnome.Shell.Extensions.CheckForUpdates no longer working

Affected version

42 (Fedora 35 Silverblue)

Bug summary

The extensions update mechanism no longer notifies the user with updates. I have several extensions that were ported to version 42 by their maintainer but the extensions manager is not notifying the update is available.

Workaround: Uninstall and reinstall extensions

gdbus call --session --dest org.gnome.Shell.Extensions --object-path /org/gnome/Shell/Extensions --method org.gnome.Shell.Extensions.CheckForUpdates returns ().

Also reported in https://github.com/mjakeman/extension-manager/issues/165#issuecomment-1100729285

Steps to reproduce

1. Open extension manager
2. Browse to an extension marked as incompatible with current GNOME version
3. Check See details section
4. Check Shell version 42 is supported (see attached screencast)

What happened

Updates are not notified, even after checking with gdbus call --session --dest org.gnome.Shell.Extensions --object-path /org/gnome/Shell/Extensions --method org.gnome.Shell.Extensions.CheckForUpdates.

What did you expect to happen

I would expect updates to be notified ;)Screencast_from_17-04-22_18_03_16

Relevant logs, screenshots, screencasts etc.