I manually created a pattern swatch and discovered I had an error. When I pull the pattern tile onto the artboard to edit I have fills where there were none. The motifs and lettering were created in Illustrator on iPad with the blob brush tool and then arranged into a repeating tile on the desktop -- most current CC release. I suspect the path orientation is reversed as when I try to remove the fill I still have a filled shape.

macOS Catalina 10.15.7, Illustrator Beta 25.0 78@21978