During, or perhaps after failing initial sync, Element iOS gets lots of empty notifications which, when clicked, load a blank page.

### Steps to reproduce

1. Sign in to Element iOS with a large account
2. Start initial syncing
3. Background the app so you can get on with your life
4. Return to Element a bit later
5. See all of the "new account" UX + copy
6. Get lots of notifications which are empty and clicking shows an blank page.

### Outcome

#### What did you expect?
Working notifications

#### What happened instead?
Empty, broken notifications.

### Your phone model

iPhone 12 Pro

### Operating system version

iOS 15.5

### Application version

1.8.20

### Homeserver

lant.uk

### Will you send logs?

Yes

No file or test is named. Reproduce the issue during initial syncing on an iPhone 12 Pro with iOS 15.5, then inspect the available logs and notification behavior when the app is backgrounded. Done means initial sync does not create empty notifications and tapping a notification opens the intended content rather than a blank page.

Written by the indexing model from the issue text.