Reddit chat port scanned the browser session. What's the reason for it?

The monitoring tool Behave! caught Reddit port scanned my Librewolf browser and the log showed it came from chat URL.

| Port | Host | From Host | Time |
|-------|----------------------------------------|-----------------|----------|
| wss: | sendbirdproxyk8s.chat.redditmedia.com | www.reddit.com | 20:30:59 |
| wss: | sendbirdproxyk8s.chat.redditmedia.com | www.reddit.com | 20:30:27 |

Is there any reason for this function that they need? Thanks.

browser chat port privacy reddit session