Unblend plugin - crashes pdn

[xod]

Effects ► Color ► Unblend plugin crashes PDN if I run it on this image:
https://www.mediafire.com/file/sspp3e96h7g0pbm/H.zip/file

The plugin can be found here:
https://forums.getpaint.net/topic/32165-unblend/

Exception details:

System.InvalidOperationException: A task may only be disposed if it is in a completion state (RanToCompletion, Faulted or Canceled).

   at System.Threading.Tasks.Task.Dispose(Boolean disposing)

   at System.Threading.Tasks.Task.Dispose()

   at ArgusPDN.Unblend.UnblendEffect.OnDispose(Boolean disposing)

   at PaintDotNet.Menus.EffectMenuBase.RunEffectImpl(Type effectType) in D:\src\pdn\src\PaintDotNet\Menus\EffectMenuBase.cs:line 1171

   at PaintDotNet.Menus.EffectMenuBase.TryRunEffect(Type effectType) in D:\src\pdn\src\PaintDotNet\Menus\EffectMenuBase.cs:line 773

   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)

   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)

   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)

   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)

   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)

   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)

   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at System.Windows.Forms.ToolStrip.WndProc(Message& m)

   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

[BoltBait]

Read this: https://forums.getpaint.net/topic/9349-plugin-problems-read-this/