CollectionView size not updating

### Description

If I set a CollectionView inside of another CollectionView the outer does not update the size of its elements if the inner grows.
Resizeing the window forces the CollectionView to update correctly.

I experianced the issue when i was trying to transport the app from Xamarin.Forms to MAUI. The same code in Xamarin works fine.

https://user-images.githubusercontent.com/43877134/178154039-10a06fac-e055-4faa-8470-4e0a2d9a3f5d.mp4

Again resizeing the window helps. Unfortunately the screen recorder does not support this and breakes.

### Steps to Reproduce

Put a CollectionView inside of another CollectionView.
My code in the app is like this:

### Version with bug

6.0.400 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

iOS, Windows, I was *not* able test on other platforms

### Affected platform versions

iOS 14 and later, windows10.0.19041.0

### Did you find any workaround?

No. I tried to force the update of the view manually by the Page.ForceLayout() and IView.InvalidateMeasure() / IView.InvalidateArrange(). Didn't work!

### Relevant log output

_No response_

The payload names no implementation files or regression test. Start by reproducing the nested CollectionView case from the supplied XAML on iOS or Windows, then observe layout behavior as the inner collection grows and after a window resize. Done means the outer CollectionView updates its element sizes without requiring a window resize.

Written by the indexing model from the issue text.