history_visibility: shared Does Not Work

[Cyberes]

Description

I have had "history_visibility": "shared" set on a room since 2022. I recently invited a new user to the room and Element said that older messages were not visible, despite this fact.

{
  "type": "m.room.history_visibility",
  "room_id": "!xxx:evulid.cc",
  "sender": "@cyberes:evulid.cc",
  "content": {
    "history_visibility": "shared"
  },
  "state_key": "",
  "origin_server_ts": 1652038391126,
  "unsigned": {
    "age": 115437193826
  },
  "event_id": "$xxx",
  "user_id": "@cyberes:evulid.cc",
  "age": 115437193826
}

Steps to reproduce

Unknown

Homeserver

matrix.evulid.cc

Synapse Version

1.144.0

Installation Method

pip (from PyPI)

Database

Single Postgres server

Workers

Multiple workers

Platform

Ubuntu in LXC.

Configuration

No response

Relevant log output

No failures in homeserver.log or browser console.

Anything else that would be useful to know?

No response

[velikopter]

"Encrypted messages before this point are unavailable" would imply the room is encrypted. Messages before that point can't be decrypted in most cases.

[Cyberes]

Yeah but I set "history_visibility": "shared" which corresponds to this:

[velikopter]

That room is encrypted, so that rule means nothing. This sounds more like an issue with Elements UI/UX to me, not Synapse.

[Cyberes]

Why is this option even shown in encrypted rooms