ExpandableRowHeight not working

I set the gridOption's expandableRowHeight attribute to 500 but it still seems to use the default 150px.

Looking into the issue further, it seems the ExpandableRowHeight is set correctly but the inner table's height does not change appropriately. If I set the expandableRowHeight to 100, the sub table actually overlaps the next row. If I set it to 500, there is a ton of white space after the sub table.