Hey @WaadSulaiman ,
I can't just label it as a bug without verifying at our end. Also, the code you provided was not complete when we requested you to give us complete minimal code sample. I was getting compile error on context.read<ThemeProvider>(), specially on read. I had to research it and then found out that it comes from provider package and then had to add it, which you didn't specify when you provided the code. Please don't assume that everybody will know what package one has to add in order to make the code sample work.

Also, below is the complete code sample which is now compile-free, but running it is giving me below errors in console:

complete code sample

import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

ThemeData _themeData = ThemeData(
  brightness: Brightness.light
);

ThemeData _lightThemeData = ThemeData(
  brightness: Brightness.dark
);

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with WidgetsBindingObserver {

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  @override
  void didChangePlatformBrightness() {
    super.didChangePlatformBrightness();
    context.read<ThemeProvider>().setThemeData(window.platformBrightness);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: const MyApp(),
    );
  }
}

class ThemeProvider with ChangeNotifier{
  void setThemeData(Brightness brightness) {
    if (brightness == Brightness.light) {
      _themeData = _themeData;
    } else {
      _themeData = _lightThemeData;
    }
    notifyListeners();
  }
}

console error log


══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following StackOverflowError was thrown building _FocusMarker:
Stack Overflow

The relevant error-causing widget was:
  MaterialApp MaterialApp:file:///Users/dhs/Documents/NCFlutter/testdemo/lib/main.dart:49:12

When the exception was thrown, this was the stack:
#0      int._toPow2String (dart:core-patch/integers.dart:365:3)
#1      int.toRadixString (dart:core-patch/integers.dart:339:14)
#2      shortHash (package:flutter/src/foundation/diagnostics.dart:3047:41)
#3      describeIdentity (package:flutter/src/foundation/diagnostics.dart:3059:95)
#4      Animation.toString (package:flutter/src/animation/animation.dart:175:15)
#5      _StringBase._interpolate (dart:core-patch/string_patch.dart:853:19)
#6      ProxyAnimation.toString (package:flutter/src/animation/animations.dart:238:71)
#7      _StringBase._interpolateSingle (dart:core-patch/string_patch.dart:831:17)
#8      StringBuffer.write (dart:core-patch/string_buffer_patch.dart:64:24)
#9      List._joinWithSeparator (dart:core-patch/growable_array.dart:497:12)
#10     List.join (dart:core-patch/growable_array.dart:442:38)
#11     _MergingListenable.toString (package:flutter/src/foundation/change_notifier.dart:401:43)
#12     DiagnosticsProperty.valueToString (package:flutter/src/foundation/diagnostics.dart:2777:60)
#13     DiagnosticsProperty.toDescription (package:flutter/src/foundation/diagnostics.dart:2791:21)
#14     TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1189:32)
#15     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1121:14)
#16     TextTreeRenderer._debugRender (package:flutter/src/foundation/diagnostics.dart:1299:39)
#17     TextTreeRenderer.render (package:flutter/src/foundation/diagnostics.dart:1121:14)
#18     DiagnosticsNode.toStringDeep.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1776:9)
#19     DiagnosticsNode.toStringDeep (package:flutter/src/foundation/diagnostics.dart:1783:6)
#20     DiagnosticsNode.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1694:18)
#21     DiagnosticsNode.toString (package:flutter/src/foundation/diagnostics.dart:1706:6)
#22     Diagnosticable.toString.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:3168:78)
#23     Diagnosticable.toString (package:flutter/src/foundation/diagnostics.dart:3170:6)
#24     _StringBase._interpolate (dart:core-patch/string_patch.dart:853:19)
#25     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4802:44)
#26     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4963:11)
#27     Element.rebuild (package:flutter/src/widgets/framework.dart:4515:5)
#28     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4773:5)
#29     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4954:11)
#30     ComponentElement.mount (package:flutter/src/widgets/framework.dart:4767:5)
...     Normal element mounting (13 frames)
#43     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3823:14)
...
...
#4569   ComponentElement.mount (package:flutter/src/widgets/framework.dart:4767:5)
...     Normal element mounting (21 frames)
#4590   Element.inflateWidget (package:flutter/src/widgets/framework.dart:3823:14)
#4591   Element.updateChild (package:flutter/src/widgets/framework.dart:3562:18)
#4592   RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:1193:16)
#4593   RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:1162:5)
#4594   RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:1110:18)
#4595   BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2654:19)
#4596   RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:1109:13)
#4597   WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:944:7)
#4598   WidgetsBinding.scheduleAttachRootWidget.<anonymous closure> (package:flutter/src/widgets/binding.dart:924:7)
(elided 11 frames from class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)

════════════════════════════════════════════════════════════════════════════════════════════════════

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4517 pos 14: 'owner!._debugCurrentBuildTarget == this': is not true.

So in order to avoid going back and forth on these, please provide a runnable code sample.

Also, check this similar issue and see if it's related to your case: #54612

[Windows][Desktop]: WidgetsBindingObserver is not working. #98355

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