TreeView File Explorer triggers XAML Binding Failures for root items

[7erra]

Describe the bug
Using Adonis UI leads to the following XAML Binding Error when using a custom TreeView to display files (project attached):

Severity	Count	Data Context	Binding Path	Target	Target Type	Description
Error	13	null	IsExpanded	TreeViewItem.NoTarget	Object	Cannot find source: RelativeSource FindAncestor, AncestorType='System.Windows.Controls.TreeViewItem', AncestorLevel='1'.

This error does not appear when removing Adonis from the project. It also does not break the application, it just logs this error.

To Reproduce
Steps to reproduce the behavior:

1. Download the attached VS2019 project
2. Open the solution file with Visual Studio 2019 Community Edition
3. Change the target folder ("P:\BIKIUtils") to a valid directory in MainWindow.xaml.cs
4. Debug the program
5. The error appears when the DataContext is set in MainWindow.xaml.cs

Expected behavior
No error warning should appear, just like when running the program without Adonis.

Screenshots

Additional context
Minimal project: Testing.zip

The code is from this SO answer: https://stackoverflow.com/a/6560891/11370741

Note about myself: I am very new to C# and WPF, just fyi.
PS.: I love the functionality of Adonis, great looks and easy implementation 👍