Element Web warns of unencrypted message in E2EE room

### Steps to reproduce

Unfortunately, no reproduction has been found yet. Will update this if something is discovered. For now, the following observations have been made:

1. There was a E2EE room inside a space.
2. A user in the room had a buggy view of the room (it appeared like an unnamed group chat with a list of people)
3. That user sent a message to the room.
4. Multiple element-web clients reported the message as unencrypted, while one user's element-android did not.

### Outcome

#### What did you expect?

All messages in an E2EE room are encrypted.

#### What happened instead?

An unencrypted message was sent to an E2EE room.

### Operating system

Arch Linux

### Browser information

chromium 100.0.4896.60-1

### URL for webapp

https://app.element.io/

### Application version

Element version: 1.10.8 Olm version: 3.2.8

### Homeserver

matrix.org

### Will you send logs?

Yes