Message sent and then entirely disappeared

### Steps to reproduce

Reporting on behalf of `@kimapr0:matrix.org` in order to track the rageshake.

> Element X eats my messages! i just sent one and it disappeared into the fog
> and this isn't the first time

### Outcome

#### What did you expect?

EX should never ever lose msgs.

#### What happened instead?

Lost sent msg.

### Your phone model

TECNO KG5j

### Operating system version

Android 11

### Application version and app store

0.4.16

### Homeserver

matrix.org

### Will you send logs?

Yes

### Are you willing to provide a PR?

No

Start by reproducing issue #3248 on a TECNO KG5j running Android 11 with Element X 0.4.16 against matrix.org, then review the available rageshake logs from the reported session. The issue is done when the reported message-loss path is identified, fixed, and verified not to lose sent messages.

Written by the indexing model from the issue text.