Writer - merge Document Fonts broken

Writer - merge Document Fonts broken

Since last Weekend the automatically created Merge Document from Flow via the Build-In Writer-Function is no longer working as before. Most of our Users are no longer able to read the Documents.
We investigated, that the Font (Robot) is no longer stored in the Document.
Adobe Errormessage:
Cannot find or create the font 'Roboto-Regular'. Some characters may not display or print correctly.

We assume that the Flow Build-In Writer Function is switched to "Merge and Store V2"
Any Solution on that?
Kind regards