Timeline in room has "reverted" to a few days ago.

### Steps to reproduce

1. I open a particular room, it's a standard encrypted group chat. It's been okay until today.
2. The room timeline is stuck at a certain point, and sending messages causes them to send but then not be visible. Verifying from other clients, the timeline looks normal.

I can scroll up to previous messages but I can't scroll past a certain point.

### Outcome

#### What did you expect?

The room timeline is up to date.

#### What happened instead?

The room timeline is not up to date.

### Operating system

Arch Linux

### Application version

Element version: 1.11.52 Crypto version: Olm 3.2.15

### How did you install the app?

Package manager (pacman)

### Homeserver

Synapse 1.92.2 (half-shot.uk)

### Will you send logs?

Yes