I have received a spreadsheet saved as .xlsx (possibly created with Excel) with cell borders. Some of these borders appear diagonally, although this is not the expected outcome.
In the (reduced) sample file it is in the F2 cell.
wrong diagonal line.xlsx (5.3 KB)
Clear direct formatting works, but it seems to be an import bug.
It is related with the text orientation (359°).
But Format Cells also show a background color not visible in the cell.