diff --git a/internal/rpc/forum_topics_preview_rpc_test.go b/internal/rpc/forum_topics_preview_rpc_test.go
index 8bceefba..d40f3d47 100644
--- a/internal/rpc/forum_topics_preview_rpc_test.go
+++ b/internal/rpc/forum_topics_preview_rpc_test.go
@@ -81,21 +81,6 @@ func TestGetForumTopicsVisibleToPublicNonMember(t *testing.T) {
 		t.Fatalf("non-member did not see the Test topic: %+v", res.Topics)
 	}
 
-	// The forum's own channel must come back with left=true so the client still
-	// offers a Join button instead of treating the forum as already joined.
-	var forumChat *tg.Channel
-	for _, c := range res.Chats {
-		if ch, ok := c.(*tg.Channel); ok && ch.ID == channel.ID {
-			forumChat = ch
-		}
-	}
-	if forumChat == nil {
-		t.Fatalf("forum channel missing from getForumTopics chats: %+v", res.Chats)
-	}
-	if !forumChat.Left {
-		t.Fatalf("non-member forum chat = %#v, want left=true", forumChat)
-	}
-
 	// A private forum still refuses a non-member.
 	priv, err := r.onChannelsCreateChannel(ownerCtx, &tg.ChannelsCreateChannelRequest{Title: "Private Forum", Megagroup: true})
 	if err != nil {
diff --git a/internal/rpc/messages_forum.go b/internal/rpc/messages_forum.go
index 03702495..4a0e939a 100644
--- a/internal/rpc/messages_forum.go
+++ b/internal/rpc/messages_forum.go
@@ -474,37 +474,12 @@ func (r *Router) forumTopicsResponse(ctx context.Context, userID int64, view dom
 		Count:    count,
 		Topics:   topics,
 		Messages: messages,
-		Chats:    r.forumTopicsChats(userID, view, channels),
+		Chats:    tgChannels(userID, channels),
 		Users:    r.tgUsersForIDs(ctx, userID, userIDs),
 		Pts:      view.Channel.Pts,
 	})
 }
 
-// forumTopicsChats projects the forum's own channel with the viewer's member
-// state (so a non-member preview carries left=true and the client still shows a
-// Join button) and every other referenced channel as a min chat. Rendering the
-// primary as a bare min chat lets a client that has no other object for the
-// channel treat the forum as already joined.
-func (r *Router) forumTopicsChats(userID int64, view domain.ChannelView, channels []domain.Channel) []tg.ChatClass {
-	if view.Channel.ID == 0 {
-		return tgChannels(userID, channels)
-	}
-	chats := make([]tg.ChatClass, 0, len(channels))
-	chats = append(chats, tgChannelChatForView(userID, view))
-	seen := map[int64]struct{}{view.Channel.ID: {}}
-	for _, extra := range channels {
-		if extra.ID == 0 {
-			continue
-		}
-		if _, dup := seen[extra.ID]; dup {
-			continue
-		}
-		seen[extra.ID] = struct{}{}
-		chats = append(chats, tgChannelChatMin(userID, extra))
-	}
-	return chats
-}
-
 func tgForumGeneralTopic(viewerUserID int64, view domain.ChannelView, topic domain.ChannelForumTopic) *tg.ForumTopic {
 	return &tg.ForumTopic{
 		My:                   view.Channel.CreatorUserID == viewerUserID && viewerUserID != 0,