"Computing recovery key" unresponsive for >9 hours

### Steps to reproduce

Unclear how, but a user got stuck on "computing recovery key" for over 9 hours.

It might be the same as:

https://github.com/element-hq/element-android/issues/1165

See bottom of https://blog.koehntopp.info/2024/02/13/the-matrix-trashfire.html

### Outcome

#### What did you expect?

Computing recovery should give a genuine progress bar, and take at most tens of seconds

#### What happened instead?

Something got very stuck.

### Your phone model

_No response_

### Operating system version

_No response_

### Application version and app store

_No response_

### Homeserver

_No response_

### Will you send logs?

No

### Are you willing to provide a PR?

No