Why are path drawn without margins?

[pekspro]

Here I'm trying to draw a 50x50 square with a path inside a grid. The coordinate is chosen such as at it should be drawn in the center:

<Grid WidthRequest="100" HeightRequest="100" BackgroundColor="LightBlue">
    <Path Fill="Blue" 
          Data="M25,25 L75,25 L75,75 L25,75z" />
</Grid>

But this is how it looks like:

It's not what I'm expecting. If I try translating the path by 100 horizontal and 200 vertical units:

<Grid WidthRequest="100" HeightRequest="100" BackgroundColor="LightBlue">
    <Path Fill="Blue" 
          Data="M125,225 L175,225 L175,275 L125,275z" />
</Grid>

The result is identical:

If I set the aspect to uniform:

<Grid WidthRequest="100" HeightRequest="100" BackgroundColor="LightBlue">
    <Path Fill="Blue" 
          Data="M25,25 L75,25 L75,75 L25,75z" 
          Aspect="Uniform" />
</Grid>

The whole grid is filled:

I guess the margins are somehow removed. Is this expected? And if so, how do I define margins and the size of my path? It's quite confusing, and I haven't found anything about this in the documentation.

I have found a solution by moving to 0,0 and then move the point that then will the size, like this:

<Grid WidthRequest="100" HeightRequest="100" BackgroundColor="LightBlue">
    <Path Fill="Blue" 
          Data="M25,25 L75,25 L75,75 L25,75 M0,0 100,100 z" 
          Aspect="Uniform" />
</Grid>

It will then also be scaled properly:

<Grid WidthRequest="200" HeightRequest="200" BackgroundColor="LightBlue">
    <Path Fill="Blue" 
          Data="M25,25 L75,25 L75,75 L25,75 M0,0 100,100 z" 
          Aspect="Uniform" />
</Grid>