ColumnSpan in Grid is not working properly when MaxWidth is 0 in VisualStudio 2019 (Version - 16.4.5)

Question

In my project created in VisualStudio 2019 with version 16.4.5, I have some columndefintions in grid and also uses columnspanning. But when I set maxwidth as 0 for some definition, the columndefinitions are not spanned to full width properly.

Code Snippet:

<Grid>  
        <Grid.ColumnDefinitions>     
            <ColumnDefinition MaxWidth="0"/>    
            <ColumnDefinition Width="*"/>  
        </Grid.ColumnDefinitions>  
        <Border Background="Red" Grid.ColumnSpan="2"/>  
        <TextBlock Grid.Column="1" Text="Testing"/>  
  </Grid>  

The same code above is working different in different frameworks. Please refer to the below ScreenShots

VS2017 - NetFramework-4.6.1

VS2019 - NETFramework-4.7.2

Please look into this and provide your suggestion to fix this issue?

Regards,
Shobika