Room is not removed from sidebar if the same room appears in different subspaces of the same space

[tb148]

Describe the bug

If the same room appears in different subspaces of the same space, this room will still appear in the sidebar for unrelated spaces.

Reproduction

1. Join the NixOS space
2. Join both the Topics and Community subspaces, and join the Home Manager room
3. Open both subspaces in the sidebar, and close the one on the top. The room on the top will be half-hidden and looks like this:

4. Now go to another space. The Home Manager room will now appear in it.

Expected behavior

The room is completely hidden and not displayed in unrelated spaces

Platform and versions

OS: Linux
Browser: Firefox 153.0
Sable version: latest nightly (dev.sable.moe)
Homeserver: Reproduced on both matrix.org and my self-hosted continuwuity server

Additional context

No response