CollectionView's `SelectionChanged` isn't fired on iOS when it's inside a grid with TapGestureRecognizer

### Description

I have a grid with a `TapGestureRecognizer`, inside this grid I have a border, and inside the border I have a collection view with single selection and a selection changed event. When an item, it doesn't fire the `SelectionChanged` event on iOS, only the gesture recognizer event, but works fine on Android. I've attached a repro project for iOS

### Steps to Reproduce

Open sample project, debug it and try clicking the CollectionView items on iOS. It should fire the `SelectionChanged` event, but it doesn't

### Link to public reproduction project repository

https://github.com/romerotg/CollectionViewGestureRecognizerIssueIOS

### Version with bug

10.0.20

### Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

### Last version that worked well

9.0.82 SR8.2

### Affected platforms

iOS

### Affected platform versions

iOS 26.0

### Did you find any workaround?

_No response_

### Relevant log output

```shell

```

Start by running the linked CollectionViewGestureRecognizerIssueIOS reproduction project on iOS and compare the CollectionView SelectionChanged behavior with Android. Trace the interaction between the Grid's TapGestureRecognizer, Border, and single-selection CollectionView; done means clicking an item fires SelectionChanged on iOS as described, while preserving the working Android behavior.

Written by the indexing model from the issue text.