cell type=inlineStr parsing problem at the beginning of the file

[lowercase]

I found a problem with inlineStr parsing, when we get a spreadsheet with

<sheetData><row r="1"><c r="A1" s="1" type="inlineStr"><is><t>Value1</t></is></c><c r="B1" s="1" type="inlineStr"><is><t>Value2</t></is></c>...

the whole row will be [nil, nil, ...]
but if we change only the first cell to

<c r="A1" s="1" type="inlineStr"><v>Value1</v></c><c r="B1" s="1" type="inlineStr"><is><t>Value2</t></is></c>...

the whole row will parse ["Value1", "Value2"...]

how to fix this behavior?