You have configured your shell, installed all necessarily extensions and updated system and you notice that extensions don't work anymore...
To fix this you need to change "shell-version" in metadata.json file for every extension.
Go to folder where are your Gnome Shell extensions located (~/.local/share/gnome-shell/extensions or /usr/share/gnome-shell/extensions)
Now for every extension you have installed change "shell-version" in metadata.json.
change 3.0 to current version of gnome shell.
If you don't know Gnome Shell version type in terminal.
Now to reload extensions pres ALT + F2 and type r
This don't mean that all extension will work, it can be that some extensions are no compatible with new Gnome Shell version.