Moderations are not delivered via MAM

[mesonium]

Environment

• ejabberd version: 25.10
• Erlang version: Erlang (SMP,ASYNC_THREADS) (BEAM) emulator version 15.2.7
• OS: Linux (Debian)
• Installed from: source

Bug description

Assuming MAM is enabled and works for normal messages

1. Create a (public) MUC
2. Join this MUC with two devices, e. g. a recent Gajim and Conversations
3. Send a message
4. Go offline with one of the devices
5. Moderate the message with the other device
6. Go back online

Observed result: The message has not been moderated.

Logs

Some extract, moderated in Conversations, while Gajim was offline

Send XML on stream = <<"
<message to='user@	<snip>/Conversations.resource' from='cavufene@conference.<snip>' type='groupchat'>
    <apply-to id='1766947069789511' xmlns='urn:xmpp:fasten:0'>
        <moderated by='cavufene@conference.<snip>/nick' xmlns='urn:xmpp:message-moderate:0'>
            <retract xmlns='urn:xmpp:message-retract:0'/>
        </moderated>
    </apply-to>
    <retract id='1766947069789511' xmlns='urn:xmpp:message-retract:1'>
        <moderated by='cavufene@conference.<snip>/nick' xmlns='urn:xmpp:message-moderate:1'/>
    </retract>
    <occupant-id id='g20AAAAgaAz8YITMBGhfjs9jF3PeT/FsmmtG0yEl4daZ3GChWms=' xmlns='urn:xmpp:occupant-id:0'/>
</message>
">>

#message{
    id = <<>>,type = groupchat,lang = <<>>,
    from =
        #jid{
            user = <<"cavufene">>,
            server = <<"<snip>">>,resource = <<>>,
            luser = <<"cavufene">>,
            lserver = <<"<snip>">>,lresource = <<>>},
    to =
        #jid{
            user = <<"<snip>">>,server = <<"<snip>">>,
            resource = <<"Conversations.Resource">>,luser = <<"<snip>">>,
            lserver = <<"<snip>">>,
            lresource = <<"Conversations.Resource">>},
    subject = [],body = [],thread = undefined,
    sub_els =
        [#fasten_apply_to{
             id = <<"1766947059140443">>,external = undefined,
             sub_els =
                 [#message_moderated_21{
                      by =
                          #jid{
                              user = <<"cavufene">>,
                              server = <<"<snip>">>,
                              resource = <<"<snip>">>,luser = <<"cavufene">>,
                              lserver = <<"<snip>">>,
                              lresource = <<"<snip>">>},
                      reason = undefined,
                      sub_els = [#message_retract_30{}],
                      occupant_id = undefined}]},
         #message_retract{
             id = <<"1766947059140443">>,reason = undefined,
             moderated =
                 #message_moderated{
                     by =
                         #jid{
                             user = <<"cavufene">>,
                             server = <<"<snip>">>,
                             resource = <<"<snip>">>,luser = <<"cavufene">>,
                             lserver = <<"<snip>">>,
                             lresource = <<"<snip>">>},
                     sub_els = [],occupant_id = undefined}},
         #occupant_id{
             id = <<"g20AAAAgaAz8YITMBGhfjs9jF3PeT/FsmmtG0yEl4daZ3GChWms=">>}],
    meta = #{stanza_id => 1766947206956153,mam_ignore => true}}

When going online in Gajim I saw

<message to='MYJID@conversations.im/gajim.Foo' from='MUCJID@conference.conversations.im/resource' type='error'>
	<apply-to id='1766865869974241'
		xmlns='urn:xmpp:fasten:0'>
		<moderated by='MUCJID@conference.conversations.im/resource'
			xmlns='urn:xmpp:message-moderate:0'>
			<retract
				xmlns='urn:xmpp:message-retract:0'/>
			</moderated>
		</apply-to>
		<retract id='1766865869974241'
			xmlns='urn:xmpp:message-retract:1'>
			<moderated by='MUCJID@conference.conversations.im/resource'
				xmlns='urn:xmpp:message-moderate:1'/>
			</retract>
			<occupant-id id='g20AAAAgq5N9uUOb0TlofAbYkPB5+EM54T3xeIwg5YsKCOQVSFk='
				xmlns='urn:xmpp:occupant-id:0'/>
				<error type='cancel'>
					<service-unavailable
						xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
						<text xml:lang='en'
							xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>User session terminated
						</text>
					</error>
					<x
						xmlns='http://jabber.org/protocol/muc#user'>
						<item jid='MYJID@conversations.im/gajim.resource' role='none' affiliation='owner'/>
						<status code='110'/>
					</x>
</message>

Additional Notes

• Reproduced on Conversations.im
• Works fine with Prosody 13.0.

Correction: Could also reproduce with Prosody 13.0 now.