Devexpress XtraGrid CustomDrawCell: Repaint of cell only on mouse over/ clicking on form elements

I have a annoying problem with repainting my devexpress XtraGrid.

I use this code to draw Icons into a cell:

Private Sub CtlGridView_CustomDrawCell(sender As Object, e As RowCellCustomDrawEventArgs) Handles CtlGridView.CustomDrawCell
        If e.Column.FieldName = NameOf(DataModel.Contract.Status) Then
            Dim view As GridView = CType(sender, GridView)
            Dim iconKeys As New List(Of String)

        ' Check Validation
        Dim guidString As String = view.GetRowCellValue(e.RowHandle, NameOf(DataModel.Contract.GuidId)).ToString()
        Dim guidId As Guid

        If Guid.TryParse(guidString, guidId) Then
            Dim validationResult As New DataModel.ValidationResult()

            ' Check if result is in cache
            If Not _validationCache.TryGetValue(guidId, validationResult) Then
                Task.Run(Sub()
                             Using taskContext As New DbContext()
                                 Dim entry As DataModel.Contract= taskContext.Contracts.Find(guidId)
                                 If entry IsNot Nothing Then
                                     validationResult = entry.Validate(taskContext, exitOnFirstError:=True)
                                 Else
                                     validationResult = New DataModel.ValidationResult
                                 End If

                                 ' Add result to cache
                                 _validationCache.TryAdd(guidId, validationResult)

                             End Using
                         End Sub)
            End If

            If cellValue = "O" Then
                iconKeys.Add("trackingchanges_showmarkup")

            ElseIf cellValue = "T" Then
                iconKeys.Add("trackingchanges_trackchanges")

            ElseIf cellValue = "I" Then
                iconKeys.Add("functionsinformation")

            ElseIf cellValue = "G" Then
                iconKeys.Add("trackingchanges_locktracking")

            ElseIf cellValue = "W" Then
                iconKeys.Add("trackingchanges_allmarkup")

            ElseIf cellValue = "K" Then
                iconKeys.Add("business_cash")
            End If

            If validationResult.Icon IsNot Nothing Then
                iconKeys.Add(validationResult.Icon)
            End If

            If iconKeys.Count > 0 Then
                Dim iconSize As New Size(32, 32)
                IconHelper.DrawIcons(e, iconKeys, _imageCollection, iconSize)
            End If

            e.Handled = True

        End If

    End If
End Sub

As you can see, I am using a task to perform a validation, and with the validation result, I get back the icon name, which I then use to draw into the cell. This works without any issues, but there is a problem: the icon is displayed only after moving over the cell with my mouse or clicking some buttons on the form. It is related to the repaint of the form, but I don't know how to handle it.

Here is a link to a video which shows the effect: https://drive.google.com/file/d/1EAXSd2S4wczKdtq2E4KFR47eEAtQRY3L/view?usp=drive_link

Unfortunately the little bird can't help me either :-)

It seems to work ok, but some validation icons appearing first after moving the mouse over it.

I tried to invalidate the entire view/row/cell like this:

            If Not _validationCache.TryGetValue(guidId, validationResult) Then
                Task.Run(Sub()
                             Using taskContext As New DbContext()
                                 Dim entry As DataModel.InstAuftrag = taskContext.InstAuftraege.Find(guidId)
                                 If entry IsNot Nothing Then
                                     validationResult = entry.Validate(taskContext, exitOnFirstError:=True)
                                 Else
                                     validationResult = New DataModel.ValidationResult
                                 End If

                                 ' Add result to cache
                                 _validationCache.TryAdd(guidId, validationResult)

                             End Using
                         End Sub)
                   view.invalidate
            End If

This works only for the initial load, but when I scroll down my list, the GUI is locked for some time, which is really annoying.

Is there any better way to accomplish this task?

Thank you!

Adding

                             view.RefreshRow(e.RowHandle)

here:

            Task.Run(Sub()
                         Using taskContext As New DbContext()
                             Dim entry As DataModel.Contract= taskContext.Contracts.Find(guidId)
                             If entry IsNot Nothing Then
                                 validationResult = entry.Validate(taskContext, exitOnFirstError:=True)
                             Else
                                 validationResult = New DataModel.ValidationResult
                             End If

                             ' Add result to cache
                             _validationCache.TryAdd(guidId, validationResult)
                             view.RefreshRow(e.RowHandle)
                         End Using
                     End Sub)