This is a bug that is being worked on: https://bugs.launchpad.net/snapd/+bug/1616650
Opened 2016. Ouch.
If you're still interested, I found the link: https://forum.snapcraft.io/t/wip-refresh-app-awareness/10736 and https://github.com/snapcore/snapd/projects/3
It is actively being worked on.
Also Telegram was really buggy a few versions back and it took several releases for notifications to start working again. It would have been nice if I could roll back and pin while they went through the first few 2.0 releases.