As a result, the glyphs are not measured and positioned properly. The issue applies to the TrueType and Type1 fonts.

An ObjectDisposedException exception is raised when a RadSvgImage is placed in a DataTemplate. It is present when the XmlSource property is utilized.

As a workaround, you can place the SVG string into a new .svg file and utilize the UriSource property of RadSvgImage.

InvalidOperationException when closing a RadWindow opened on a separated UI thread. The exception message is: "Cannot use a DependencyObject that belongs to a different thread than its parent Freezable."

To work this around, you can merge the Telerik.Windows.Controls.Navigation.xaml dictionary in the Resources of all RadWindow instances open on another thread and then set their Style property to the RadWindowStyle from the merged .xaml dictionary.

<telerik:RadWindow x:Class="WpfApp84.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp84" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        mc:Ignorable="d"  Height="450" Width="800" Style="{DynamicResource RadWindowStyle}">
    <telerik:RadWindow.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/Telerik.Windows.Controls.Navigation;component/Themes/GenericWindows11.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </telerik:RadWindow.Resources>
</telerik:RadWindow>

Empty cells appear when the RadGridView contains many cells in the viewport and the view gets resized.

To work this around you can extract and modify the ControlTemplate of GridViewCell, in order to set the MinHeight property of the "PART_ContentPresenter" element to a number close to the RowHeight of the RadGridView control.

The fly view is not properly displayed when the second item is clicked and the sub-items are expanded (see attached video). 

Attached is a project with a workaround as well. 

When you inherit BingRestMapProvider and BingRestTileMapSource, following the custom map provider approach
https://docs.telerik.com/devtools/wpf/controls/radmap/how-to/howto-custom-provider

the map does not display any tiles. This is due to internal property TopLayer not set correctly to the TileMapSource class.