Excel shows 1-1 Data Type as Date when downloaded with Chrome and as String when downloaded with Firefox

[ferpinan]

Hello.

I have a table that has data as 1-1, 1-2, 1-3, 2-1... format.

When I download the xlsx file in firefox this data is shown in Excel as it is (1-1, 1-2...) but when I download with Chrome is shown as Date.

Is reproducible here: https://jsfiddle.net/andoni2222/9mbq06vh/5/

Thank you.