User notification preferences are ignored by omnichannel

Description:

I have all notifications turned off but I'm still getting desktop notifications for chat's initiated in Livechat / Omnichannel:

My notifications preferences are being respected in all areas but omnichannel and I can't see any way to set prefs specifically for omnichannel as I can other channels.

Steps to reproduce:

1. Go to your user preferences and set all notifications to "Nothing"
2. Send a message via Livechat / Omnichannel

Expected behavior:

No desktop notification should occur

Actual behavior:

A desktop notification occurs.

Server Setup Information:

Version of Rocket.Chat Server: 3.13.1
Operating System: Ubuntu 20.04
Deployment Method: Snap
Number of Running Instances: 1
NodeJS Version: v12.21.0
MongoDB Version: 3.6.14 / wiredTiger (oplog Enabled)

Client Setup Information

Desktop App or Browser Version: Firefox 78.8.0esr, Chrome Version 90.0.4430.85 (Official Build) (x86_64)
Operating System: OSX 10.11

Start by tracing how user notification preferences are applied to desktop notifications, then compare that path with notifications triggered by Livechat or Omnichannel messages. Reproduce the issue with all preferences set to “Nothing”; done means no desktop notification appears for an Omnichannel chat while other notification behavior remains unchanged.