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

[matrixbot]

This issue was originally created by @lil5 at https://github.com/matrix-org/dendrite/issues/3324.

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

https://github.com/matrix-org/dendrite/assets/17646836/aa1575d9-20db-4f16-b345-a35aa5037be4

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.

[matrixbot]

This comment was originally posted by @S7evinK at https://github.com/matrix-org/dendrite/issues/3324#issuecomment-1934736559.

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

[matrixbot]

This comment was originally posted by @lil5 at https://github.com/matrix-org/dendrite/issues/3324#issuecomment-1934849227.

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.