Reconnection after disconnect due to bad network connectivity ended up with one-way video call

### Steps to reproduce

1. Using call.element.io with a legacy room (no e2e secret provided in the URL) with two people in the call.
2. Have a call on a network with some problems: voice and video were occasionally interrupted.
3. I saw the remote video freeze, associated with a total network issue on my machine (element-web cut off, etc)
4. I returned by refreshing the browser
5. I could see the voice and video of the other party, but they could only see a black screen from me.
6. Refreshing on my side again did not help
7. Moving to a new call URL (now with e2e secret) fixed it.

### Outcome

#### What did you expect?
Reconnection should get back to two way sound & video

#### What happened instead?
Reconnection caused one-way sound & video

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

call.element.io

### Will you send logs?

Yes

The issue names no source files or tests; start by reproducing the steps at call.element.io with a legacy room and an interrupted network connection. Verify that refreshing after the disconnect restores two-way voice and video, rather than leaving the reporter's video black to the other participant.

Written by the indexing model from the issue text.