element-ios no longer syncing in the background

### Steps to reproduce

1. Join channels and have others post messages / mention user
2. Open element-ios app
3. Every time the app must first sync before the updates to the channel or channel list reflect the actual state of things (even when clicking on a notification - the message the notification is related to takes ~30 seconds to appear)

### Outcome

#### What did you expect?

When opening the app I expect the state of the channel list and messages within a channel to be up to date.

#### What happened instead?

The app shows the syncing spinner at the top for several seconds while it retireves all the latest state.

### Your phone model

iPhone 15 Pro Max

### Operating system version

17.2.1

### Application version

1.11.5

### Homeserver

Synapse v1.98.0

### Will you send logs?

No