Keyboard navigation stops working when setting SelectionMode to "Extended", SelectionUnit to "Cell"  and pressing twice the down keyboard key . 

The problem should be resolved with version Q1 2016. 

The JAWS screen reader cannot read the RadTreeListView and also its rows and cells.

This reproduces after the 2019.3.917 release.

To work this around create a custom RadTreeListViewAutomationPeer:

public class CustomTreeListView : RadTreeListView
{
	protected override AutomationPeer OnCreateAutomationPeer()
	{
		return new CustomTreeListViewAutomationPeer(this);
	}
}

public class CustomTreeListViewAutomationPeer : RadTreeListViewAutomationPeer
{
	public CustomTreeListViewAutomationPeer(RadTreeListView owner) 
		: base(owner)
	{
		var methodInfo = typeof(RadTreeListViewAutomationPeer).GetMethod("GetItemPeers", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
		methodInfo.Invoke(this, null);
	}

	protected override List<AutomationPeer> GetChildrenCore()
	{
		var frameworkPeer = new FrameworkElementAutomationPeer((FrameworkElement)this.Owner);
		return frameworkPeer.GetChildren();
	}
}

By default the AutoExpandItemsAfterFilter property of RadTreeListView is set to True, which means that when you filter the data, the parents of all found child items will be expanded automatically. However, if you call the CollapseAllHierarchyItems method this functionality stops working.

To work this around, you can reset the ItemsSource property instead of using the CollapseAllHierarchyItems.

The selected rows of TreeListView are not returned when calling SelectionPattern.GetSelection method.

The problem can be reproduced with RadGridView as well.

workaround:
Extract the ControlTemplate for the TreeListViewRow and set the Style explicitly or remove the local Style setter.

Items are expanded when they match the filtering criteria.

Once I added the filterdescriptor, the tree started to expand itself
and when I put a break point in RowIsExpandedChanged event handler
the treelistviewrow's IsExpanded property is already true

Can you have a look at the attached sample application
and try to achieve the following:
1. keep the on demand load (so only loadchildren when user clicked on the arrow to expand)
2. apply filter only on the expanded nodes