Markdown doesn't work in threaded replies

### Steps to reproduce

1. See a threaded message with formatting, e.g. "**message**"
2. Reply to it

### Outcome

#### What did you expect?
> **message**

#### What happened instead?
> \*\*message\*\*

### Your phone model

_No response_

### Operating system version

_No response_

### Application version and app store

1.4.34

### Homeserver

matrix.org

### Will you send logs?

No

### Are you willing to provide a PR?

No

No files or tests are named. Reproduce the issue by opening a formatted threaded message in Element Android and replying to it, then trace the threaded-message rendering and reply handling to identify where the Markdown formatting is lost; done means the reply preserves the expected formatting.

Written by the indexing model from the issue text.