A direct message answers in the form its recipient writes in

Lemmy 0.19 (most of the threadiverse) and Mbin take a private message only
as a ChatMessage and refuse a direct Note. A direct message to one account
elsewhere that writes to us as ChatMessages now goes out as one: to it
alone, without a mention in its text, kept on the post (Post.AsChatMessage)
so the served copy and an edit match. No software name decides it.

Live against Lemmy 0.19: alice's answer to lemmyuser's private message and
another persona's message to lemmyuser arrive (29 checks). A first message
to an account that never wrote to anyone here is still a Note, which they
refuse; G-0008 keeps that open for the owner.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

tools/pasture/scenarios/lemmy19.sh

@@ -87,10 +87,21 @@ echo "  private messages"
 alice_on_lm=$(lm GET "resolve_object?q=@alice_lemmy19@privapub.test" | j "print(d['person']['person']['id'])")
 lm POST private_message "{\"content\":\"a secret from Lemmy 0.19\",\"recipient_id\":$alice_on_lm}" >/dev/null
 until_true 45 'curl -s -H "$LAH" "$P/api/v1/conversations" | grep -q "a secret from Lemmy 0.19"' && ok "Lemmy 0.19's private message arrives as a DM" || ko "Lemmy 0.19's private message missing on PrivaPub"
-# (0.19 takes a private message only as a ChatMessage and answers alice's direct Note 400, G-0008; 1.0 takes a Note)
-curl -s -o /dev/null -X POST -H "$LAH" $P/api/v1/statuses -d 'status=@lemmyuser@lemmy19.test a secret from PrivaPub&visibility=direct'
-until_true 30 'lm GET "private_message/list?limit=50" | grep -q "a secret from PrivaPub"' && ok "alice's DM arrives as a Lemmy 0.19 private message" \
-	|| xf "alice's DM never reaches Lemmy 0.19, which takes private messages only as ChatMessage (G-0008)"
+# lemmyuser wrote as a ChatMessage, so alice's answer goes out as one
+curl -s -o /dev/null -X POST -H "$LAH" $P/api/v1/statuses -d "status=@lemmyuser@lemmy19.test an answer from PrivaPub $run&visibility=direct"
+until_true 45 'lm GET "private_message/list?limit=50" | grep -q "an answer from PrivaPub $run"' && ok "alice's answer reaches Lemmy 0.19 as a ChatMessage" || ko "alice's answer never reached Lemmy 0.19"
+# another persona writing to lemmyuser, who writes to us as ChatMessages, does so in kind too
+LBT=$(privapub_token bob_lemmy19)
+curl -s -o /dev/null -X POST -H "Authorization: Bearer $LBT" $P/api/v1/statuses -d "status=@lemmyuser@lemmy19.test a word from bob $run&visibility=direct"
+until_true 45 'lm GET "private_message/list?limit=50" | grep -q "a word from bob $run"' && ok "bob's DM to lemmyuser goes as a ChatMessage too" || ko "bob's DM never reached Lemmy 0.19"
+# (0.19 takes a private message only as a ChatMessage and answers a direct Note 400: a first message to someone who
+# never wrote to anyone here is a Note, G-0008. 1.0 takes a Note)
+quiet="quiet$run"
+QT=$(site lemmy19.test -s -X POST "$LM/api/v3/user/register" -H 'Content-Type: application/json' \
+	-d "{\"username\":\"$quiet\",\"password\":\"Lemmy-Pasture-Pass-1\",\"password_verify\":\"Lemmy-Pasture-Pass-1\",\"show_nsfw\":false}" | j "print(d['jwt'])")
+curl -s -o /dev/null -X POST -H "$LAH" $P/api/v1/statuses -d "status=@$quiet@lemmy19.test a first word from PrivaPub $run&visibility=direct"
+until_true 30 'site lemmy19.test -s "$LM/api/v3/private_message/list?limit=50" -H "Authorization: Bearer $QT" | grep -q "a first word from PrivaPub $run"' \
+	&& ok "alice's first DM to someone there arrives" || xf "alice's first DM to someone there never arrives, a Note Lemmy 0.19 refuses (G-0008)"
 
 echo "  moderation"
 p_locked() { curl -s -H "$LAH" "$P/api/v1/statuses/$lm_cats_on_p" | j "print((d.get('privapub') or {}).get('locked'))"; }

tools/pasture/town/gaps.json

@@ -110,7 +110,7 @@
 	},
 	{
 		"id": "G-0008",
-		"title": "A direct message to a Lemmy 0.19 or Mbin account never arrives: both take a private message only as a ChatMessage",
+		"title": "A first direct message to a Lemmy 0.19 or Mbin account never arrives: both take a private message only as a ChatMessage",
 		"match": {
 			"feature": "deliver\\.direct",
 			"observer": "(mbin|lemmy19)"
@@ -120,6 +120,6 @@
 		"code": "lemmy 0.19.20 crates/apub/src/protocol/objects/chat_message.rs: ChatMessageType has ChatMessage alone, so a Create{Note} to a person answers 400 (Lemmy 1.0 takes a Note); mbin 1.10.1 src/Service/ActivityPub/ActivityPubContent.php getVisibility(): a Note neither public nor to the author's followers throws 'PM: not implemented'",
 		"opened": "2026-10-05",
 		"status": "open",
-		"note": "Neither server's actors say so, and PrivaPub never decides by a server's software name, so choosing ChatMessage for a recipient waits for the owner. Pleroma and Akkoma file a ChatMessage as a chat apart from direct messages, so sending both would show them twice. Mbin's API also never starts a conversation with an account elsewhere."
+		"note": "Since 2026-10-05 a direct message to someone who writes to us as ChatMessages goes out as one (Post.AsChatMessage), so answers arrive. A first message to someone who never wrote to anyone here is still a Note: neither server's actors say what they take, and PrivaPub never decides by a server's software name, so that waits for the owner. Pleroma and Akkoma file a ChatMessage as a chat apart from direct messages, so sending both would show them twice. Mbin's API never starts a conversation with an account elsewhere."
 	}
 ]