A previous audio upload plays back immediately after testing my own.

### Steps to reproduce

1. Upload an audio clip using Android on latest RC.
2. Test audio uploading using Firefox (web) signed in to latest RC
3. Notice that @kittykat's message from two uploads ago plays immediately after my own.

### Outcome

#### What did you expect?

I expected to only hear my own recording.

#### What happened instead?

I heard both my recording, and the message uploaded by @kittykat immediately after.

### Operating system

Ubuntu 21.10

### Browser information

95.0 (64-bit)

### URL for webapp

https://staging.element.io/

### Application version

Element version: 1.9.8-rc.1 Olm version: 3.2.8

### Homeserver

matrix.org

### Will you send logs?

Yes