Fix missing logging.

src/Avalonia.Base/PropertyStore/BindingEntry.cs

@@ -89,6 +89,7 @@ namespace Avalonia.PropertyStore
             if (value is BindingNotification n)
             {
                 value = n.Value;
+                LoggingUtils.LogIfNecessary(_frame.Owner.Owner, Property, n);
             }
 
             if (value == AvaloniaProperty.UnsetValue)

src/Avalonia.Base/PropertyStore/LocalValueUntypedBindingObserver.cs

@@ -37,6 +37,7 @@ namespace Avalonia.PropertyStore
             if (value is BindingNotification n)
             {
                 value = n.Value;
+                LoggingUtils.LogIfNecessary(_owner.Owner, Property, n);
             }
 
             if (value == AvaloniaProperty.UnsetValue)

src/Avalonia.Base/PropertyStore/LoggingUtils.cs

@@ -1,12 +1,21 @@
 using System;
 using System.Runtime.CompilerServices;
 using Avalonia.Data;
-using Avalonia.Logging;
 
 namespace Avalonia.PropertyStore
 {
     internal static class LoggingUtils
     {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void LogIfNecessary(
+            AvaloniaObject owner,
+            AvaloniaProperty property,
+            BindingNotification value)
+        {
+            if (value.ErrorType != BindingErrorType.None)
+                Log(owner, property, value.Error!);
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void LogIfNecessary<T>(
             AvaloniaObject owner,
@@ -45,6 +54,19 @@ namespace Avalonia.PropertyStore
             }
         }
 
+        private static void Log(
+            AvaloniaObject owner,
+            AvaloniaProperty property,
+            Exception e)
+        {
+            owner.GetBindingWarningLogger(property, e)?.Log(
+                owner,
+                "Error in binding to {Target}.{Property}: {Message}",
+                owner,
+                property,
+                e.Message);
+        }
+
         private static void Log<T>(
             AvaloniaObject owner,
             AvaloniaProperty property,

src/Avalonia.Base/PropertyStore/UntypedBindingEntry.cs

@@ -113,6 +113,7 @@ namespace Avalonia.PropertyStore
             if (value is BindingNotification n)
             {
                 value = n.Value;
+                LoggingUtils.LogIfNecessary(_frame.Owner.Owner, Property, n);
             }
 
             if (value == AvaloniaProperty.UnsetValue)

tests/Avalonia.Base.UnitTests/VisualTests.cs

@@ -281,13 +281,17 @@ namespace Avalonia.Base.UnitTests
         {
             var target = new Decorator();
             var root = new TestRoot { Child = target, DataContext = "foo" };
-            var called = false;
+            var called = 0;
 
             LogCallback checkLogMessage = (level, area, src, mt, pv) =>
             {
                 if (level >= Avalonia.Logging.LogEventLevel.Warning)
                 {
-                    called = true;
+                    Assert.Equal("Error in binding to {Target}.{Property}: {Message}", mt);
+                    Assert.Same(target, pv[0]);
+                    Assert.Equal(Decorator.TagProperty, pv[1]);
+                    Assert.Equal("Could not find a matching property accessor for 'Foo' on 'foo'", pv[2]);
+                    ++called;
                 }
             };
 
@@ -296,7 +300,7 @@ namespace Avalonia.Base.UnitTests
                 target.Bind(Decorator.TagProperty, new Binding("Foo"));
             }
 
-            Assert.True(called);
+            Assert.Equal(1, called);
         }
 
         [Fact]