The thing about snaps and app image is they are containerized. The idea behind that is to help keep the apps separate from the main file subsystem by sandboxing them from each other as well as not cluttering your hdd with different versions of the same libraries to make them work.
Because of the sandboxing, once you close the app it stops running in the background therefore there is nothing to get notifications from.
IMHO, this is why snap and app image programs are not advisable for programs you may need notifications from on a, generally, required/needed basis.
As for superconductivity, the only way around that problem is to download from source, compile it and let it run natively on your system in the background, or add it to you auto startup list so it is running at boot time.