Duplicating Character Sheets leads to the copy being completely Empty!

In my Campaign we use the " Das Schwarze Auge 5th Edition (German) Sheet". The Sheet itself is fine and is all filled out for each character. HOWEVER when Duplicating the sheet, the duplicate is basically empty! NOTHING of the Values was carried over! Had this happen at least TWICE during Prep today! Just right click the sheet to duplicate and click on "Duplicate File". WHY is this happening?! Latest Windows 11, latest Firefox, NO Addons active, Jumpgate.

Make it 10 times. Here in comparison. THIS is the Sheet completely filled out: THIS is the Sheet right after Duplicating: As you can see, the Duplicate is completely EMPTY... Quite Annoying if you need to do this on the fly while DMing a campaign!