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all space members are able to see invite only rooms in spaces

See original GitHub issue

Description

After upgrading synapse from 1.34 to 1.35 (debian testing), space members with default power level in the space are able to see invite only rooms in the space’s “Explore rooms”-view that they are not allowed to join.

Steps to reproduce

create a private space S with account A
add/create a public room P in space S with account A
add/create a room R in space S with account A set to:
- “Who can access this room?”: “Only people who have been invited”
- “Who can read history?”: “Members only (since they joined)”
invite account B to space S

Expected outcome

account B is able to see room P in the “Explore rooms”-view of the space
account B is not able to see room R in the “Explore rooms”-view

Actual outcome

account B is able to see room P in the “Explore rooms”-view and is able to join it.
account B is able to see room R in the “Explore rooms”-view. However, when trying to join, account b is presented with the error message: Failed to join room You are not invited to this room.

As per https://gist.github.com/t3chguy/fdf541446d992d1fc96b8089b342fe7b#gistcomment-3755026, this does not seem to be the intended behavior.

Version information

Homeserver: matrix.pack.rocks (ran by me)
Version: 1.35.0+bullseye1
Install method: debs from https://matrix.org/packages/debian/
Platform: qemu-VM on Debian 11, no containers involved
Default Room Version: 6 I did set experimental_features: { spaces_enabled: true } in /etc/matrix-synapse/homeserver.yaml in 1.34 which is still present. Removing it does not change the behavior described above.