IterationCount has no effect

[MrKDx]

The parameter GifImage.IterationCount has currently no effect.
Expection is, when set to x the animation will run for x times and then stop.
For example change MainWindow.xaml in AvaloniaGif.Demo Line 16 and add gif:GifImage.IterationCount="5"
Start the Demo and chose an image. The animation will start immediately but will not stop after 5 iterations.

If set an exception occurs after a while:

System.InvalidOperationException
HResult=0x80131509
Message=Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
Source=System.Private.CoreLib
StackTrace:
at System.ThrowHelper.ThrowInvalidOperationException_ConcurrentOperationsNotSupported()
at System.Collections.Generic.Dictionary2.FindEntry(TKey key) at System.Collections.Generic.Dictionary2.TryGetValue(TKey key, TValue& value)
at Avalonia.Rendering.DirtyVisuals.Add(IVisual visual)
at AvaloniaGif.GifInstance.RenderTick(TimeSpan time) in AvaloniaGif-master\AvaloniaGif\GifInstance.cs:line 79
at Avalonia.Rendering.DefaultRenderTimer.InternalTick(TimeSpan tickCount)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)