QGIS - using fill ring and snapping to segments not working

When using the fill ring tool and having to run along the edge of the polygon the fill ring tool works perfectly when snapping to a vertex, but when I try and snap to a segment, which appears to work fine until you finish the fill ring and you get an error saying the ring was not contained in the feature.

What other option do I have to cut out an area of the polygon along the boundary of the polygon while still being offered the attributes table to name that new feature?