Trying to make freezed work for hierarchy of generic classes, but get the error that the copyWith implementation cannot be generated

[TB-StarcMed]

I am trying to make a hierarchy of generic classes work, but get the error that the copyWith implementation cannot be generated since the parameter value is not cloneable. The following is the (obfuscated) source code for this example:

import 'package:flutter/foundation.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'freezed_test2.freezed.dart';

abstract class BaseClass<V> extends ChangeNotifier {
  V _value;

  BaseClass({required V value}) : _value = value;

  V get value => _value;
  void set value(V newValue) {
    if (_value != newValue) {
      _value = newValue;
      notifyListeners();
    }
  }
}

@Freezed(copyWith: false, addImplicitFinal: false)
class ChildClass1<V> extends BaseClass<V> with _$ChildClass1<V> {
  bool _isValid;

  ChildClass1({required super.value, bool isValid = true}) : _isValid = isValid;

  bool get isValid => _isValid;
  void set isValid(bool newValue) {
    if (newValue != _isValid) {
      _isValid = newValue;
      notifyListeners();
    }
  }
}

@unfreezed
class ChildClass2<V> extends BaseClass<V> with _$ChildClass2<V> {
  String? _syntaxErrorText;

  ChildClass2({required super.value, String? syntaxErrorText}) : _syntaxErrorText = syntaxErrorText;

  String? get syntaxErrorText => _syntaxErrorText;
  void set syntaxErrorText(String? newText) {
    if (_syntaxErrorText != newText) {
      _syntaxErrorText = newText;
      notifyListeners();
    }
  }
}

I get the error:

E freezed on <directory path of the file>/freezed_test2.dart:
  The class ChildClass1 requested a copyWith implementation, yet the parameter `value` is not cloneable.
  
  To fix, either:
  - Disable copyWith using @Freezed(copyWith: false)
  - Make `value` optional
  - Make sure `this.value` is accessible from the copyWith method
  
  package:<directory path of the file>/freezed_test2:21:7
     ╷
  21 │ class ChildClass1<V> extends BaseClass<V> with _$ChildClass1<V> {
     │       ^^^^^^^^^^^
     ╵

Even if I change the source code to the following (because I do necessarily need the copyWith function), I get the same error in the output from the build_runner.

import 'package:flutter/foundation.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'freezed_test2.freezed.dart';

abstract class BaseClass<V> extends ChangeNotifier {
  V _value;

  BaseClass({required V value}) : _value = value;

  V get value => _value;
  void set value(V newValue) {
    if (_value != newValue) {
      _value = newValue;
      notifyListeners();
    }
  }
}

@Freezed(copyWith: false, addImplicitFinal: false)
class ChildClass1<V> extends BaseClass<V> with _$ChildClass1<V> {
  bool _isValid;

  ChildClass1({required super.value, bool isValid = true}) : _isValid = isValid;

  bool get isValid => _isValid;
  void set isValid(bool newValue) {
    if (newValue != _isValid) {
      _isValid = newValue;
      notifyListeners();
    }
  }
}

@Freezed(copyWith: false, addImplicitFinal: false)
class ChildClass2<V> extends BaseClass<V> with _$ChildClass2<V> {
  String? _syntaxErrorText;

  ChildClass2({required super.value, String? syntaxErrorText}) : _syntaxErrorText = syntaxErrorText;

  String? get syntaxErrorText => _syntaxErrorText;
  void set syntaxErrorText(String? newText) {
    if (_syntaxErrorText != newText) {
      _syntaxErrorText = newText;
      notifyListeners();
    }
  }
}

What can I do to make this work?
How could I make sure that value is accessible from the copyWith method (which would be the 3rd option of the 3 suggested fixes in the output)?

As of my research, I have found the following tickets, that are all still open and related to each other:

• Generation failure on copyWith, despite being accessible. #1231
• Mixed mode prevent usage of required super #1274
• Generation failure on copyWith, despite copyWith being disabled #1230