Display Name of newly created user is replaced with the first person tries to communicate with them.

[lil5]

Background information

• Dendrite version or git SHA:
• SQLite3 or Postgres?: Postgres
• Running in Docker?: Yes
• go version:
• Client used (if applicable):

Description

• What is the problem:
  Display Name of newly created user is replaced with the first person tries to communicate with them.
• Who is affected:
  Any new user this is generated from the cmd
  On top of that this new user will be set as admin, even if the -admin flag is not used
• How is this bug manifesting:
  The shared_secret_registration is shown as a device.
• When did this first appear:
  After running /_synapse/admin/v1/register with a loggedin access token

ezgif-7-9342ddaa03.mov

Steps to reproduce

1. Create a first user 1 using the cli register command with the username override
2. Login user 1 in a client like Element
3. Create a second user 2 using the cli register command with the username user
4. With user 1 in Element chat with user 2
5. Before sending a chat the displayname of user 2 is user
6. Send a message to user 2
7. The displayname of user 2 changes to override This should not happen, user 2 is also suddenly an admin.

[S7evinK]

I'm assuming you mean "room admin", right? That's the correct behavior when creating DMs.

[lil5]

Ah right, the wording is naturally confusing, but I guess thats more an issue to take up with the client devs, nevertheless 3326 will fix the main issue.