HamburgerMenu with own ViewModel collection produces System.Windows.Data Warning and Error

[punker76]

Describe the bug

Using a collection with own ViewModels different to HamburgerMenuItem and HamburgerMenuItemCollection produces following output warning and errors:

System.Windows.Data Warning: 40 : BindingExpression path error: 'IsVisible' property not found on 'object' ''ServerSettingsViewModel' (HashCode=5659087)'. BindingExpression:Path=IsVisible; DataItem='ServerSettingsViewModel' (HashCode=5659087); target element is 'ListBoxItem' (Name=''); target property is 'Visibility' (type 'Visibility')
System.Windows.Data Error: 11 : Fallback value 'True' (type 'String') cannot be converted for use in 'Visibility' (type 'Visibility'). BindingExpression:Path=IsVisible; DataItem='ServerSettingsViewModel' (HashCode=5659087); target element is 'ListBoxItem' (Name=''); target property is 'Visibility' (type 'Visibility') FormatException:'System.FormatException: True is not a valid value for Visibility.
 ---> System.ArgumentException: Requested value 'True' was not found.
   at System.Enum.TryParseByName(RuntimeType enumType, String originalValueString, ReadOnlySpan`1 value, Boolean ignoreCase, Boolean throwOnFailure, UInt64& result)
   at System.Enum.TryParseUInt32Enum(RuntimeType enumType, String originalValueString, ReadOnlySpan`1 value, UInt32 maxInclusive, Boolean ignoreCase, Boolean throwOnFailure, TypeCode type, UInt32& result)
   at System.Enum.TryParse(Type enumType, String value, Boolean ignoreCase, Boolean throwOnFailure, Object& result)
   at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
   at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
   --- End of inner exception stack trace ---
   at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
   at System.Windows.Data.BindingExpressionBase.ConvertValue(Object value, DependencyProperty dp, Exception& e)'

Steps to reproduce

1. Create an ObservableCollection with ViewModels
2. Create DataTemplate for ItemTemplate and OptionsItemTemplate to use own ViewModel
3. Create DataTemplate for the ViewModels
4. Bind HamburgerMenu ItemsSource to the collections

Now if the app starts, the above warnings and errors occurs.

Expected behavior

HamburgerMenu should also work with own collections and ViewModels like other ItemsControls.

Environment

MahApps.Metro version: v2.0.1
Windows build number: Win10 1909 [Version 10.0.18363.836]
Visual Studio: 2019 16.6.0
Target Framework: .Net Core 3.1 (v4.5.2, v4.7.2)