Update

Author: buenaflor

packages/flutter/ios/sentry_flutter/Sources/sentry_flutter/SentryFlutterPlugin.swift

@@ -624,9 +624,11 @@ public class SentryFlutterPlugin: NSObject, FlutterPlugin {
   }
 
   @objc public class func addBreadcrumbAsBytes(_ breadcrumbBytes: NSData) {
-      guard let breadcrumbString = String(data: breadcrumbBytes as Data, encoding: .utf8),
-            let jsonData = breadcrumbString.data(using: .utf8),
-            let breadcrumbDict = try? JSONSerialization.jsonObject(with: jsonData) as? [String: Any] else {
+      guard let breadcrumbDict = try? JSONSerialization.jsonObject(
+          with: breadcrumbBytes as Data,
+          options: []
+      ) as? [String: Any] else {
+          print("addBreadcrumb failed in native cocoa: could not parse bytes")
           return
       }
       let breadcrumbInstance = PrivateSentrySDKOnly.breadcrumb(with: breadcrumbDict)

packages/flutter/lib/src/native/cocoa/sentry_native_cocoa.dart

@@ -203,19 +203,7 @@ class SentryNativeCocoa extends SentryNativeChannel {
   @override
   Future<void> addBreadcrumb(Breadcrumb breadcrumb) async {
     tryCatchSync('addBreadcrumb', () {
-      // Normalize breadcrumb data like the method channel does
-      final normalizedBreadcrumb = Breadcrumb(
-        message: breadcrumb.message,
-        category: breadcrumb.category,
-        data: normalizeMap(breadcrumb.data),
-        level: breadcrumb.level,
-        type: breadcrumb.type,
-        timestamp: breadcrumb.timestamp,
-        // ignore: invalid_use_of_internal_member
-        unknown: breadcrumb.unknown,
-      );
-
-      final jsonString = json.encode(normalizedBreadcrumb.toJson());
+      final jsonString = json.encode(breadcrumb.toJson());
       final bytes = utf8.encode(jsonString);
       final nsData = bytes.toNSData();
 

packages/flutter/lib/src/native/java/sentry_native_java.dart

@@ -228,18 +228,7 @@ class SentryNativeJava extends SentryNativeChannel {
     JByteArray? breadcrumbBytes;
 
     tryCatchSync('addBreadcrumb', () {
-      final normalizedBreadcrumb = Breadcrumb(
-        message: breadcrumb.message,
-        category: breadcrumb.category,
-        data: normalizeMap(breadcrumb.data),
-        level: breadcrumb.level,
-        type: breadcrumb.type,
-        timestamp: breadcrumb.timestamp,
-        // ignore: invalid_use_of_internal_member
-        unknown: breadcrumb.unknown,
-      );
-
-      final jsonString = json.encode(normalizedBreadcrumb.toJson());
+      final jsonString = json.encode(breadcrumb.toJson());
       final bytes = utf8.encode(jsonString);
       breadcrumbBytes = JByteArray.from(bytes);