Chat jumps, can't reach latest, unread messages

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Steps to reproduce

1. Have a long 1:1 chat
2. Receive three messages
3. Open the chat

Expected behaviour

I can see the latest messages

Actual behaviour

I see the latest messages briefly, then the chat jumps/scrolls months of chat history

The browser (FF) seems really busy and doesn't allow me to scroll down. If I get there it jumps back up.

Talk app

Talk app version: (see apps admin page: /index.php/settings/apps)

Custom Signaling server configured: yes/no and version (see additional admin settings: /index.php/index.php/settings/admin/talk#signaling_server)

Custom TURN server configured: yes/no (see additional admin settings: /index.php/settings/admin/talk#turn_server)

Custom STUN server configured: yes/no (see additional admin settings: /index.php/settings/admin/talk#stun_server)

Browser

Microphone available: yes/no

Camera available: yes/no

Operating system: Windows/Ubuntu/...

Browser name: Firefox/Chrome/...

Browser version: 85/96/...

Browser log

Server configuration

Operating system: Ubuntu/RedHat/...

Web server: Apache/Nginx

Database: MySQL/Maria/SQLite/PostgreSQL

PHP version: 8.0/8.1/8.2

Nextcloud Version: (see admin page)

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your server installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Server log (data/nextcloud.log)

Insert your server log here

Start by reproducing the long 1:1 chat scenario in Firefox: receive three messages, open the chat, and observe the scroll jump. Review the browser console and network logs, which are not included in the report, while tracing the chat view's scrolling behavior. Done means the latest messages remain reachable and the view does not jump back into older history.