@-mentioning disappears when using „reply“

**Describe the bug**

When replying to a message, @-mentioning disappears after sending the message

**To Reproduce**
Steps to reproduce the behavior:
1. In a chat with at least one other person
2. Long press on a message
3. Click „Reply“
4. Type "@"
5. Select another person in the chat
6. Send the message

**Expected behavior**

The @-mentioning is displayed like an @-mentioning

** Actual behavior **

Just the user name is visible. The @-mentioning disappears.

**Screenshots**


**Smartphone (please complete the following information):**
- Device: Fairphone 3
- OS: /e/-OS Android 9

**Additional context**
- App version and store 1.0.12 (F-Droid)
- Homeserver: matrix.tchncs.de

Add any other context about the problem here.