Is there a bug in Studio 2017 regarding Exclusions by Color/Columns in Microsoft Excel 2007-2016

I wonder if there's a bug in Studio 2017 regarding  Exclusions by Color/Columns in Microsoft  Excel 2007-2016.

I have an Excel with an English column (column B) and an Italian column (column E).

I color the B column in red, go to Options --> File Types --> Microsoft Excel 2007-2016 --> Exclusions, select the Red under Skip cells formatted with the selected color, but Studio still imports the column.

I also tried typing "B" after pressing Add Column under Skip selected columns, but still Studio imports the column.

Is this a bug or there's more prep work to be done before you can exclude such column?