After VS update colored Rectange-s added to Children class of the ScrollbarMargin prevent mouse clicks on the scrollbar.

I've developed an extension some time ago that allows to highlight a section of the scrollbar with the specified color, here is how I do it:

		/// <summary>On layout changed analyze the regions and lines and highlight them on the scroll bar if needed.</summary>
		private void OnLayoutChanged(object sender, TextViewLayoutChangedEventArgs e)
		{
			Children.Clear();

			int n = AllAdornments.TextAdornment.Regions.Length;
			for (int i = 0; i < n; i++)
			{
				if (AllAdornments.TextAdornment.Regions[i].Adornment != null&& AllAdornments.TextAdornment.Regions[i].EndLine < e.NewSnapshot.LineCount)
				{
					var rect = new Rectangle();
					var firstLine = e.NewSnapshot.GetLineFromLineNumber(AllAdornments.TextAdornment.Regions[i].StartLine);
					var lastLine = e.NewSnapshot.GetLineFromLineNumber(AllAdornments.TextAdornment.Regions[i].EndLine);
					double top, bottom;
					double firstLineTop;
					MapLineToPixels(firstLine, out firstLineTop, out bottom);
					SetTop(rect, firstLineTop);
					SetLeft(rect, ScrollBarLeftPadding);
					MapLineToPixels(lastLine, out top, out bottom);
					rect.Height = bottom - firstLineTop;
					rect.Width = ScrollBarWidth;
					Color color = Communicator.LerpColor(AllAdornments.TextAdornment.UserBackgroundCol,
						AllAdornments.TextAdornment.Regions[i].Adornment.Color, ScrollBarIntensity
						* AllAdornments.TextAdornment.Regions[i].Adornment.IntensityMult);
					color.A = ScrollBarOpacity;
					rect.Fill = new SolidColorBrush(color);

					Children.Add(rect);
				}
			}
                }

Here is how it looks in Visual Studio:



This worked perfectly for a long time (around 1,5 - 2 years), but when I updated VS two months ago a problem emerged: I can no longer click on the section of the scrollbar margin with the colored Rectangle - the mouse click simply does nothing as long as it is above the colored Rectangle. On the empty section of the scrollbar it works as usual. Before I could not only click on my Rectangle-s, but hold the mouse button down and drag the scrollbar. Is there any way I can bring back this functionality?