Ag Grid React. Master Detail Chevron Doesn't show if grid has a rowModelType of viewport

Question

I've added props necessary to enable the master detail grid (i.e. masterDetail, detailCellRenderer, and frameworkComponents). The master detail grid functionality works fine if the grid is not a view port, but for this use case it requires displaying a window of a large set of data, calling an api to fetch another window of data when paginating, and apply the data to the grid via this.params.setRowData(data);

For some reason, the master detail grid doesn't work if the rowModelType is viewport. How can I make it work with the viewport?

Thanks