outcast affiliation without effect in moderated MUC rooms

[Dunedan]

I have a strange problem with the "outcast" affiliation not being honored for moderated MUC rooms (using Ejabberd 23.01 on Debian). Is this intentional or possibly a bug?

Here are the options of a test room I just set up. For now the room is unmoderated.

$ ejabberdctl get_room_options test_muc_room conference.localhost
title
description
allow_change_subj       false
allow_query_users       true
allow_private_messages  true
allow_private_messages_from_visitors    nobody
allow_visitor_status    true
allow_visitor_nickchange        true
public  true
public_list     true
persistent      true
moderated       false
captcha_protected       false
members_by_default      false
members_only    false
allow_user_invites      true
allow_subscription      false
password_protected      false
password
anonymous       true
presence_broadcast      [moderator,participant,visitor]
allow_voice_requests    false
voice_request_min_interval      1800
max_users       200
logging true
vcard
vcard_xupdate   undefined
captcha_whitelist       {0,nil}
mam     false
pubsub
enable_hats     false
lang    en

Affiliations before outcasting the test user:

$ ejabberdctl get_room_affiliations test_muc_room conference.localhost
admin   localhost       owner
test_user       localhost       member

So far everything is fine. test_user can join the MUC room and chat, just as intended.

When I set the affiliation to "outcast" for the test user now, everything still behaves as expected: the user gets kicked from the room and can't rejoin. The room affiliations now look like:

$ ejabberdctl get_room_affiliations test_muc_room conference.localhost
admin   localhost       owner
test_user       localhost       outcast test

However, when I change the room to be moderated now, the user can suddently rejoin and chat, even though the affiliation is still in place. It doesn't matter if I change the moderated option before or after outcasting the user, the behavior is the same.

$ ejabberdctl get_room_options test_muc_room conference.localhost
title
description
allow_change_subj       false
allow_query_users       true
allow_private_messages  true
allow_private_messages_from_visitors    nobody
allow_visitor_status    true
allow_visitor_nickchange        true
public  true
public_list     true
persistent      true
moderated       true
captcha_protected       false
members_by_default      false
members_only    false
allow_user_invites      true
allow_subscription      false
password_protected      false
password
anonymous       true
presence_broadcast      [moderator,participant,visitor]
allow_voice_requests    false
voice_request_min_interval      1800
max_users       200
logging true
vcard
vcard_xupdate   undefined
captcha_whitelist       {0,nil}
mam     false
pubsub
enable_hats     false
lang    en

$ ejabberdctl get_room_affiliations test_muc_room conference.localhost
admin   localhost       owner
test_user       localhost       outcast test

Why does this happen? Is this supposed to be this way and if so why?

[licaon-kter]

bookworm-backports has 23.10, same issue?

[Dunedan]

With ejabberd 23.10 from bookworm-backports I can't reproduce the issue and outcasting works as I'd expect. 👍
Is there by any chance a specific commit which fixed that, you can point me to?

[licaon-kter]

maybe dfe4884

[Dunedan]

I wonder if it might got fixed by #4010 instead.