Can't overwrite dataset in Power BI Service anymore

[Yumti]

I used to be able to overwrite an existing dataset in Power BI service by uploading a new Excel-file with the same name. Then it would update the data for all the connected reports.

Now it doesn't overwrite the dataset anymore but creates a new copy with the same name.

How do I update a dataset then? The reports are all created in Power BI Service so I can't download them to Desktop.