MapPinHandler Does Not Return the Marker View on iOS

### Description

In iOS, handler.ToPlatform returns an annotation, but not an annotation view. It does not seem possible to modify the view (pin color for example) within the MapPinHandler. Android works fine.

### Steps to Reproduce

Add a .Mapper.AppendToMapping for MapPinHandler on a map page.
var annotation = handler.PlatformView (is a MKPointAnnotation).
No way to get the annotation view.

### Link to public reproduction project repository

None

### Version with bug

7.0 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

iOS

### Affected platform versions

11-16

### Did you find any workaround?

_No response_

### Relevant log output

_No response_