Cannot init sync

### Steps to reproduce

1. Where are you starting? What can you see?
I unignored an account and clicked ok to init sync
3. What do you click?
Nothing, just open the app
3. More steps…
Sometimes after unignoring someone and doing init sync, it works, but if I've changed my account avatar prior to the last init sync it'll do this. It used to just take 10 or 15 minutes, now it is indefinite. And no, I don't have that much account data cause when I login using fresh element install it takes 5 seconds to init sync

### Outcome

#### What did you expect?
I expect for init sync to work like it does on first install, where everything syncs my account completely fine.
#### What happened instead?
It says loading account, that works, then it says "Loading your conversations" and gets stuck there. It does not progress no matter what I do, but it'll work fine if I reinstall and add my account again though that is a bit tedious.

### Your phone model

Pixel 5a

### Operating system version

Android 13.0

### Application version and app store

Element 1.5.18, olm 3.2.12. Google Play Store

### Homeserver

Synapse 1.74.0

### Will you send logs?

Yes

### Are you willing to provide a PR?

No