Check the attached exmaple, the row should have 100px height, but it has 200px.
It seems that the "height: -webkit-fill-avaiable" of the grid container, which limits it to 100px is not taken into account during track sizing so it grows up to 200px.

In WebKit this works fine and the size of the row is 100px.
 

Deleted: grid-fill-available.html 372 bytes

grid-fill-available.html 372 bytes View Download