Add-PnPDataRowsToProvisioningTemplate with empty -fields parameter not working?

Hi,

I want to use a modern SPO team site als a template for similar projects with a prefilled task list (very similar projects). 

I created a site template with Save-PnPProvisioningTemplate and tried to add the Data rows with Add-PnPDataRowsToProvisioningTemplate and a empty -fields parameter but that does not work. I need exact the same task list as in the template.

Does anybody know if this is a bug?

I already discussed on this particular topic right here: Copy SPO team site with task list contens/row data - Microsoft Q&A but wanted to check here before I post a bug on github.

Thanks

Chris