This is not exactly a solution to your issue but a way to install the extensions you want in the meantime while you are looking for a solution.
It is done manually as described in the article linked to below:
https://www.debugpoint.com/manual-installation-gnome-extension/
Once installed in this way, they would work as expected and you will be notified as well from the Extensions app when there is an update to them. You don’t need to do it manually then again. Just a simple log out and log in will do.