XPath that selects table cells using wildcard

I am writing an XPath which targets the TD cells in an HTML table. It is written in such a way that I can select all cells in a row, select all cells in a column, or select an individual cell by providing a wildcard for either a row or column.

XPath:

//*[@id='myGrid']/div/table/tbody/tr[{index0}]/td[{index1}]

Cases:

Select first row:
index0 = 1 index1 = * (BROKEN)

Select first column:
index0 = * index1 = 1 (WORKS)

Select top left cell:
index0 = 1 index1 = 1 (WORKS)

The first case is omitting certain TDs (yellow cells indicate XPath selection):

The HTML structure for the divisions reveals that some TD's do not contain a 'span'. Not sure why this would prevent the TD from being selected, since the XPath targets TDs.