I have been working with drawings for my company the last days and I write here a possible bug I found. First of all thank you very much to all the people working on this project! This kind of posts are by now my unique "help" here.
The Spreadsheet view is shown incorrectly if the Spreadsheet area contains merged cells in the same column. More explicitly, the view is shown incorrectly if the area includes at least one row below the merged cells.