I've experienced possibly this bug intermittently since moving to Manjaro Gnome with Gnome 3.30.2. In my case it's not all the extensions that are reset, but two that I've set different to default: Places status indicator and Topicons plus. Furthermore, rebooting usually puts it right; it's the locking and unlocking that deactivates those extensions on my system.
I've experienced possibly this bug intermittently since moving to Manjaro Gnome with Gnome 3.30.2. In my case it's not all the extensions that are reset, but two that I've set different to default: Places status indicator and Topicons plus. Furthermore, rebooting usually puts it right; it's the locking and unlocking that deactivates those extensions on my system.