Unable to accept verification requests

### Steps to reproduce

More details here: https://github.com/vector-im/element-android/issues/4085

I am unable to accept verification requests from this user.

### What happened?

### What did you expect?
I was expecting to receive a verification request. I received the system notification (with the app locked) for it but when clicking it nothing happened. I've submmited rageshake logs associated with this.

### Your phone model

iPhone 11 Pro

### Operating system version

iOS 14.8

### Application version

Element version 1.5.4

### Homeserver

vector.modular.im

### Have you submitted a rageshake?

Yes

Start with the linked issue at element-android/issues/4085 and the submitted rageshake logs, then investigate the locked-app notification flow for verification requests on iOS. Done means tapping the notification presents the request and allows it to be accepted on the reported device and app version.

Written by the indexing model from the issue text.