I'm trying to divide up polygons in QGIS with a line I've assembled from a variety of constituent parts. The line has been successfully merged into a single object, and as far as I can tell is a continuous single line from end to end. Unfortunately, some of the polygons it's drawn across simply do not respond when using the 'cut with line' tool - nothing happens to them at all.
What could be going on here?
Some of the original parts had gaps between them, but I went in and manually altered all the ones I could find so that each segment of the final line crossed over the previous and next segments. Those crossed segments have resolved into smooth connections as part of the line merge process. The line does extend past the edges of every polygon it's drawn across.
I can provide both the line and the polygon data if that would be helpful.