corrected attachment builders

packages/stream_chat_flutter/lib/src/message_widget.dart

@@ -96,7 +96,7 @@ class MessageWidget extends StatefulWidget {
     this.bottomRowBuilder,
     this.deletedBottomRowBuilder,
     this.onReturnAction,
-    Map<String, AttachmentBuilder>? customAttachmentBuilders,
+    this.customAttachmentBuilders,
     this.readList,
     this.padding,
     this.textPadding = const EdgeInsets.symmetric(
@@ -406,6 +406,9 @@ class MessageWidget extends StatefulWidget {
   /// Builder for respective attachment types
   final Map<String, AttachmentBuilder> attachmentBuilders;
 
+  /// Builder for respective attachment types (user facing builder)
+  final Map<String, AttachmentBuilder>? customAttachmentBuilders;
+
   /// Center user avatar with bottom of the message
   final bool translateUserAvatar;
 
@@ -530,7 +533,7 @@ class MessageWidget extends StatefulWidget {
         showPinButton: showPinButton ?? this.showPinButton,
         showPinHighlight: showPinHighlight ?? this.showPinHighlight,
         customAttachmentBuilders:
-            customAttachmentBuilders ?? attachmentBuilders,
+            customAttachmentBuilders ?? this.customAttachmentBuilders,
         translateUserAvatar: translateUserAvatar ?? this.translateUserAvatar,
         onQuotedMessageTap: onQuotedMessageTap ?? this.onQuotedMessageTap,
         onMessageTap: onMessageTap ?? this.onMessageTap,