Star columns not computed correctly when ScrollView spans across all of them

[pikausp]

Description

When I create a Grid with multiple star columns and put a ScrollView inside of it which spans across all of those columns, the columns don't have the appropriate width no matter the desired ratio.

<Grid RowDefinitions="Auto, *"
      ColumnDefinitions="*, 2*,3*">
    <Frame BackgroundColor="Red"/>
    <Frame BackgroundColor="Blue"
            Grid.Column="1"/>
    <ScrollView Grid.Row="1" Grid.ColumnSpan="3">
        <Frame BackgroundColor="Green"/>
    </ScrollView>
</Grid>

Produces the following

Whereas leaving out one column (reducing the ColumnSpan to 2) displays a layout I would expect

Steps to Reproduce

See the description/repo

Link to public reproduction project repository

https://github.com/pikausp/GridStarColumnRepro

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 13

Did you find any workaround?

No response

Relevant log output

No response

[mattleibow]

This is fixed now in .NET 7 and .NET 8