Don't bind to AssignBinding

src/Markup/Avalonia.Markup.Xaml/XamlIl/CompilerExtensions/Transformers/AvaloniaXamlIlBindingPropertyAssignmentsTransformer.cs

@@ -20,6 +20,10 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
                 var vn = pv.Values[0];
                 if (vn.Type.GetClrType().Equals(XamlIlPseudoType.Null))
                     return node;
+
+                if (pv.Property.GetClrProperty().CustomAttributes
+                    .Any(a => a.Type.Equals(types.AssignBindingAttribute)))
+                    return node;
                 
                 // Special handling for markup extensions
                 if (vn.Type.IsMarkupExtension)

src/Markup/Avalonia.Markup.Xaml/XamlIl/CompilerExtensions/Transformers/AvaloniaXamlIlWellKnownTypes.cs

@@ -14,6 +14,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
         public IXamlIlType IDisposable { get; }
         public XamlIlTypeWellKnownTypes XamlIlTypes { get; }
         public IXamlIlType Transitions { get; }
+        public IXamlIlType AssignBindingAttribute { get; }
         
         public AvaloniaXamlIlWellKnownTypes(XamlIlAstTransformationContext ctx)
         {
@@ -25,6 +26,7 @@ namespace Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers
             IBinding = ctx.Configuration.TypeSystem.GetType("Avalonia.Data.IBinding");
             IDisposable = ctx.Configuration.TypeSystem.GetType("System.IDisposable");
             Transitions = ctx.Configuration.TypeSystem.GetType("Avalonia.Animation.Transitions");
+            AssignBindingAttribute = ctx.Configuration.TypeSystem.GetType("Avalonia.Data.AssignBindingAttribute");
             AvaloniaObjectBindMethod = AvaloniaObjectExtensions.FindMethod("Bind", IDisposable, false, IAvaloniaObject,
                 AvaloniaProperty,
                 IBinding, ctx.Configuration.WellKnownTypes.Object);