INotifyDataErrorInfo Error Message is overflowing the TextBox inside a DataGrid

Bug explanation

Is anyone here having the same problem when using INotifyDataErrorInfo where the Error Message of the TextBox is overflowing? No issue when using ValidationRules at all.

I have a DataGrid with 100 items, each item has a TextBox. In my ViewModel, I implemented the INotifyDataErrorInfo. For some reason, if all of the Error Message is shown below the TextBox, some of them are overflowing. I tried using ValidationRules but everything is fine, the problem occurs only when using INotifyDataErrorInfo.

Here is an example of the issue when all of the error is being shown.

Could this be an issue with the DataGrid? The first 20 items are showing the error message in the correct position, but after that until the end of the items is not.

UPDATE: I tried to input the correct entry in the TextBox, then remove the text by clicking the clear icon of the TextBox. After that, the position of the Error Message is corrected, but then I tried to scroll and the problem occur again.

• I tried typing some text.
  

• Then cleared the text by clicking the clear icon. (Noticed that the position of the error message is corrected)
  

• Retype some text. (Everything is fine as of now)
  

• I tried to scroll, going down. (Problem occurred again)
  

• Then scroll again, going up. (Still the same problem)
  

Version

using version 4.5.0

Beginne damit, das Problem in einem WPF DataGrid mit 100 TextBox-Elementen, INotifyDataErrorInfo-Validierung und der gemeldeten Version 4.5.0 von MaterialDesignInXamlToolkit zu reproduzieren. Vergleiche das Verhalten mit ValidationRules, dem Leeren von Text und dem Scrollen. Als erledigt gilt die Aufgabe, wenn Validierungsmeldungen während der Bearbeitung und des Scrollens für alle Zeilen korrekt positioniert bleiben.