NullReferenceException at BindingExpression

### Description

In app log:

`System.NullReferenceException:Object reference not set to an instance of an object at Microsoft.Maui.Controls.WeakEventProxy`2[[System.ComponentModel.INotifyPropertyChanged, System.ObjectModel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],[System.ComponentModel.PropertyChangedEventHandler, System.ObjectModel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].TryGetHandler(PropertyChangedEventHandler& )
at Microsoft.Maui.Controls.BindingExpression.WeakPropertyChangedProxy.OnPropertyChanged(Object sender, PropertyChangedEventArgs e)
at SomeViewModel.SomeProperty.OnPropertyChanged(String propertyName)`

could be race condition in _expression.Apply() (Dispatcher.Dispatch)
[https://github.com/dotnet/maui/blob/bf96ba698d8abb3b5b69396c905abc0078280b20/src/Controls/src/Core/BindingExpression.cs#L713](url)

possible fix=> obj.Dispatcher.DispatchIfRequired(() => _expression?.Apply());

### Steps to Reproduce

_No response_

### Link to public reproduction project repository

_No response_

### Version with bug

9.0.110 SR12

### Is this a regression from previous behavior?

Not sure, did not test other versions

### Last version that worked well

_No response_

### Affected platforms

Android

### Affected platform versions

_No response_

### Did you find any workaround?

trying to update bound properties on the UI thread.

### Relevant log output

```shell

```

Start by reading src/Controls/src/Core/BindingExpression.cs around line 713 and trace the WeakEventProxy`2.TryGetHandler call shown in the Android stack trace. Establish a reproducible Android case involving updates from SomeViewModel.SomeProperty, then verify the NullReferenceException no longer occurs under the reported threading conditions.

Written by the indexing model from the issue text.