[cloud_firestore]: Blob field in Firestore is always retrieved as false on Windows

[tortiolaware]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Database

Which platforms are affected?

Windows

Description

I'm trying to store and read a Blob object in cloud_firestore on Windows.

• The Blob is stored correctly in Firestore.
• However, when I try to retrieve it, the value is always returned as false. -> Error! Expected: return a Blob
• The same code works as expected on Android.

Reproducing the issue

1. run: flutter create prova
2. configure Firebase and firestore with firebase cli
3. create main.dart as follow:

import 'dart:convert';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:prova/firebase_options.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  final value = "Ciao come stai?";

  final docRef =
      FirebaseFirestore.instance.collection("prova").doc("my-document");

  await docRef.set({
    "myBlob": Blob(utf8.encode(value)),
  });

  final myBlobStored = (await docRef.get()).get("myBlob");
  print(myBlobStored); //prints false -> ERROR!
}

The object retrived is a boolean value equals to false

Firebase Core version

3.11.0

Flutter Version

3.27.4

Relevant Log Output

Flutter dependencies

Expand Flutter dependencies snippet

Dart SDK 3.6.2
Flutter SDK 3.27.4
prova 1.0.0+1

dependencies:
- cloud_firestore 5.6.3 [cloud_firestore_platform_interface cloud_firestore_web collection firebase_core firebase_core_platform_interface flutter meta]
- cupertino_icons 1.0.8
- firebase_core 3.11.0 [firebase_core_platform_interface firebase_core_web flutter meta]
- flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine]

dev dependencies:
- flutter_lints 5.0.0 [lints]
- flutter_test 0.0.0 [flutter test_api matcher path fake_async clock stack_trace vector_math leak_tracker_flutter_testing async boolean_selector characters collection leak_tracker leak_tracker_testing material_color_utilities meta source_span stream_channel string_scanner term_glyph vm_service]

transitive dependencies:
- _flutterfire_internals 1.3.51 [collection firebase_core firebase_core_platform_interface flutter meta]
- async 2.11.0 [collection meta]
- boolean_selector 2.1.1 [source_span string_scanner]
- characters 1.3.0
- clock 1.1.1
- cloud_firestore_platform_interface 6.6.3 [_flutterfire_internals collection firebase_core flutter meta plugin_platform_interface]
- cloud_firestore_web 4.4.3 [_flutterfire_internals cloud_firestore_platform_interface collection firebase_core firebase_core_web flutter flutter_web_plugins]
- collection 1.19.0
- fake_async 1.3.1 [clock collection]
- firebase_core_platform_interface 5.4.0 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.20.0 [firebase_core_platform_interface flutter flutter_web_plugins meta web]
- flutter_web_plugins 0.0.0 [flutter characters collection material_color_utilities meta vector_math]
- leak_tracker 10.0.7 [clock collection meta path vm_service]
- leak_tracker_flutter_testing 3.0.8 [flutter leak_tracker leak_tracker_testing matcher meta]
- leak_tracker_testing 3.0.1 [leak_tracker matcher meta]
- lints 5.1.1
- matcher 0.12.16+1 [async meta stack_trace term_glyph test_api]
- material_color_utilities 0.11.1 [collection]
- meta 1.15.0
- path 1.9.0
- plugin_platform_interface 2.1.8 [meta]
- sky_engine 0.0.0
- source_span 1.10.0 [collection path term_glyph]
- stack_trace 1.12.0 [path]
- stream_channel 2.1.2 [async]
- string_scanner 1.3.0 [source_span]
- term_glyph 1.2.1
- test_api 0.7.3 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph]
- vector_math 2.1.4
- vm_service 14.3.0
- web 1.1.0

Additional context and comments

No response

[SelaseKay]

cc @russellwheatley