diff --git a/go-chat-bridge b/go-chat-bridge
index 6a69ce0..0b0b629 100755
Binary files a/go-chat-bridge and b/go-chat-bridge differ
diff --git a/telegram_listener.go b/telegram_listener.go
index 62e5537..0b5fce2 100644
--- a/telegram_listener.go
+++ b/telegram_listener.go
@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"sort"
+	"strings"
 
 	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
 )
@@ -61,6 +63,14 @@ func (b *Bridge) StartTelegramListener(
 					log.Printf("[Telegram] cannot decode update item: %v", err)
 					continue
 				}
+				updateKinds := detectTelegramUpdateKinds(raw)
+				log.Printf(
+					"[Telegram][diag] update_id=%d kinds=%s has_message=%t has_message_reaction=%t",
+					update.UpdateID,
+					strings.Join(updateKinds, ","),
+					update.Message != nil,
+					update.MessageReaction != nil,
+				)
 				offset = update.UpdateID + 1
 
 				if update.Message != nil {
@@ -77,7 +87,28 @@ func (b *Bridge) StartTelegramListener(
 				}
 
 				if update.MessageReaction != nil {
-					for _, reaction := range addedReactions(update.MessageReaction.OldReaction, update.MessageReaction.NewReaction) {
+					log.Printf(
+						"[Telegram][diag] message_reaction chat_id=%d message_id=%d old=%s new=%s",
+						update.MessageReaction.Chat.ID,
+						update.MessageReaction.MessageID,
+						formatTelegramReactions(update.MessageReaction.OldReaction),
+						formatTelegramReactions(update.MessageReaction.NewReaction),
+					)
+					added := addedReactions(update.MessageReaction.OldReaction, update.MessageReaction.NewReaction)
+					if len(added) == 0 {
+						log.Printf(
+							"[Telegram][diag] message_reaction chat_id=%d message_id=%d has no added reactions",
+							update.MessageReaction.Chat.ID,
+							update.MessageReaction.MessageID,
+						)
+					}
+					for _, reaction := range added {
+						log.Printf(
+							"[Telegram][diag] added reaction chat_id=%d message_id=%d reaction=%q",
+							update.MessageReaction.Chat.ID,
+							update.MessageReaction.MessageID,
+							reaction,
+						)
 						onReactionAdded(update.MessageReaction.Chat.ID, update.MessageReaction.MessageID, reaction)
 					}
 				}
@@ -171,3 +202,33 @@ func reactionDisplayValue(reaction telegramReactionType) string {
 	}
 	return reaction.Type
 }
+
+func detectTelegramUpdateKinds(raw json.RawMessage) []string {
+	var payload map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &payload); err != nil {
+		return []string{"unmarshal_error"}
+	}
+	kinds := make([]string, 0, len(payload))
+	for key := range payload {
+		if key == "update_id" {
+			continue
+		}
+		kinds = append(kinds, key)
+	}
+	if len(kinds) == 0 {
+		return []string{"none"}
+	}
+	sort.Strings(kinds)
+	return kinds
+}
+
+func formatTelegramReactions(list []telegramReactionType) string {
+	if len(list) == 0 {
+		return "[]"
+	}
+	parts := make([]string, 0, len(list))
+	for _, reaction := range list {
+		parts = append(parts, reactionKey(reaction)+"="+reactionDisplayValue(reaction))
+	}
+	return "[" + strings.Join(parts, ", ") + "]"
+}