Grid RowDefinitions/ColumnDefinitions breaks hot reload in VS 2022

[asklar]

Describe the bug

This might be related to #6370 but since this is another aspect of the break, filing separately

Steps to reproduce the bug

<Grid RowDefinitions="123,*">
...
</Grid>

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.0 (If you're seeing your issue in older previews of WinUI 3, please try this release)

Windows app type

• UWP
• Win32

Device form factor

No response

Windows version

Insider Build (xxxxx)

Additional context

No response

[sonnemaf]

I can confirm this.

<Grid Margin="4"
        ColumnDefinitions="1*,1*"
        ColumnSpacing="4"
        RowDefinitions="1*,1*"
        RowSpacing="4">
    <Rectangle Fill="#F25022" />
    <Rectangle Grid.Column="1"
                Fill="#7FBA00" />
    <Rectangle Grid.Row="1"
                Fill="#00A4EF" />
    <Rectangle Grid.Row="1"
                Grid.Column="1"
                Fill="#FFB900" />
</Grid>

[wbokkers]

I reported this already here: #5944

[HEIC-to-JPEG-Dev]

This means that there is effectively no visual editor for WinUI if you use this XAML as VS doesn't have one, and hot reload doesn't work as it doesn't recognise the XAML if any part is modified.

[github-actions]

This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[sbaeumlisberger]

The problem still exists with Windows App SDK 1.3

[JesseCol]

As wbokkers says, looks like a dupe of #5944 , closing.