m.room.tombstone events are not honored in spaces

[promasu]

Steps to reproduce

1. Create a space
2. Create a new space with the predecessor attribute set:

{
  "creation_content": { 
    "predecessor": { 
      "room_id": "!OLD_ROOM_ID",
      "event_id": "Last event"
    },
    "type": "m.space"
  }
}

3. Validate new space has attribute set by looking at the advanced tab of the space settings.

4. Send a m.room.tombstone event to the old space

curl
-X PUT
-H 'Authorization: Bearer ACCESS_TOKEN'
-H 'Content-Type: application/json'
-d '{"replacement_room":"!NEW_ROOM_ID","body":"Space upgrade"}'
'https://example.com/_matrix/client/v3/rooms/!OLD_ROOM_ID/state/m.room.tombstone'

5. Check if m.room.tombstone is set properly

curl
-H 'Authorization: Bearer ACCESS_TOKEN'
'https://example.com/_matrix/client/v3/rooms/!OLD_ROOM_ID/messages?limit=1&dir=b'

{
  "chunk": [
    {
      "type": "m.room.tombstone",
      "sender": "@USERNAME",
      "content": {
        "replacement_room": "!NEW_ROOM_ID",
        "body": "Space upgrade"
      },
      "room_id": "!OLD_ROOM_ID",
      "state_key": "",
      "origin_server_ts": 1772210302287,
      "unsigned": {
        "membership": "join",
        "age": 48940
      },
      "event_id": "$EVENT_ID",
      "user_id": "@USERNAME",
      "age": 48940
    }
  ],
  "start": "t9-6942_0_0_0_0_0_0_0_0_0_0_0",
  "end": "t9-6941_0_0_0_0_0_0_0_0_0_0_0"
}

6. Check in Element Web if something happened

Outcome

What did you expect?

Matrix spec specifies

Clients which understand m.room.tombstone events and the predecessor field on m.room.create events should communicate to the user that the room was upgraded.

When the event is received I expect Element to show a message in the space that it has been replaced and display a link that

What happened instead?

Nothing

Operating system

Arch Linux

Browser information

Firefox for Arch Linux 147.0.2

URL for webapp

No response

Application version

Element version: 1.12.11 Crypto version: Rust SDK 0.16.0 (82e97d4), Vodozemac 0.9.0

Homeserver

Synapse 1.148.0+ess.1

Will you send logs?

No

[promasu]

@t3chguy As per spec an upgrade of Spaces is possible as they still are a room.
I'm not requesting to be able to upgrade a Space from within Element.

This issue is about Element being non-compliant to the matrix specification.
Please reopen the issue as this is not a duplicate.

[t3chguy]

I'm not requesting to be able to upgrade a Space from within Element.

They are coupled in the application, they will be implemented together. As part of the UI for upgrading the UX of how an upgrade would be presented to the user would be considered. It is a duplicate of the wider issue. As per the issue I linked, it is X-Needs-Design.

This issue is about Element being non-compliant to the matrix specification.

Agreed, element-meta issues apply to multiple Element clients.

[promasu]

Thanks for clarification!