if the message is not in the main messages list, try to find in the threads messages

packages/stream_chat/lib/src/client/channel.dart

@@ -1694,7 +1694,10 @@ class ChannelClientState {
   void _listenReactionDeleted() {
     _subscriptions.add(_channel.on(EventType.reactionDeleted).listen((event) {
       final oldMessage =
-          messages.firstWhereOrNull((it) => it.id == event.message?.id);
+          messages.firstWhereOrNull((it) => it.id == event.message?.id) ??
+              threads.values
+                  .expand((e) => e)
+                  .firstWhereOrNull((e) => e.id == event.message?.id);
       final reaction = event.reaction;
       final ownReactions = oldMessage?.ownReactions
           ?.whereNot((it) =>
@@ -1714,7 +1717,10 @@ class ChannelClientState {
   void _listenReactions() {
     _subscriptions.add(_channel.on(EventType.reactionNew).listen((event) {
       final oldMessage =
-          messages.firstWhereOrNull((it) => it.id == event.message?.id);
+          messages.firstWhereOrNull((it) => it.id == event.message?.id) ??
+              threads.values
+                  .expand((e) => e)
+                  .firstWhereOrNull((e) => e.id == event.message?.id);
       final message = event.message!.copyWith(
         ownReactions: oldMessage?.ownReactions,
       );