Notifications doesn't work with multipie instances in 6.4.2

We decided to update RC from 5.x to lasted 6.4.2 version, and after update we saw that notifications doesn't work anymore - sound and desktop, with browser or electron client.
Also we don't see at admin panel IP-address of any instance and it's hearbeat:

Does 6.4.2 supports such setup or it is some bug? it's like described here - https://docs.rocket.chat/deploy/deploy-rocket.chat/scaling-rocket.chat/running-multiple-instances only difference - we're using docker images. And 3.x, 4.x and 5.x worked smoothly with this setup.

Server Setup Information:

• Version of Rocket.Chat Server: 6.4.2
• Operating System: containers with debian 11
• Deployment Method: docker
• Number of Running Instances: 20
• NodeJS Version: v14.21.3
• MongoDB Version: 5.0.21 / wiredTiger (oplog Enabled)

We tested update to 6.4.2 on test installation with only one app instance - and notifications work pretty well on it.

Start with the linked multiple-instances deployment documentation and reproduce the reported Docker setup, comparing one instance with 20 instances on Rocket.Chat 6.4.2. Investigate why browser and Electron notifications stop working and why the admin panel lacks instance IP addresses and heartbeat data; done means both behaviors work in the multi-instance deployment.