[Android] Talkback reports incorrect number of list items

### Description

https://github.com/xamarin/Xamarin.Forms/issues/4090

Possible Fix:
https://github.com/xamarin/Xamarin.Forms/pull/10151

### Expected Behavior

Talkback will report that the tapped item is in a list of 2 items.

### Actual Behavior

Talkback will report that the tapped item is in a list of 4 items.

### Steps to Reproduce

1. Enable Talkback
2. Open the repro project from #4085
3. Open the Detail page and tap "Browse" or "About"

### Version with bug

Preview 11

### Last version that worked well

Unknown/Other

### Affected platforms

Android

### Affected platform versions

Android

### Did you find any workaround?

_No response_

### Relevant log output

_No response_

Start with the repro project referenced from #4085, enable Android TalkBack, and follow the steps to open the Detail page and tap “Browse” or “About.” Confirm the current four-item announcement and investigate the Android list semantics; done means TalkBack reports the tapped item as being in a list of 2 items.

Written by the indexing model from the issue text.