Person-to-Person direct chat, invite 3rd person, cause unexpected behaviors.

### Steps to reproduce

1. Open "direct message" section.
2. select a person.
3. click options -> Invite
4. select 3rd persion and add.
5. there will be a group chat room in direct message section.
6. user will experience some unexpected behaviors afterward.

### Outcome

#### What did you expect?

It would be nice to disable invite option in direct message room.

#### What happened instead?

unexpected behaviors.

### Your phone model

Irrelevant

### Operating system version

Irrelevant

### Application version and app store

1.3.9

### Homeserver

matrix.org

### Will you send logs?

No