Posted by sp1der on Feb 20, 2014; 10:26am
URL: https://forum.librecad.org/How-to-fill-Paint-an-area-tp5709605p5709617.html

Yes this is expected behavior, in order to hatch successfully there needs to be a 'closed' contour/boundary. Lines just crossing over each other do not form this closed contour because the end points of the lines do not meet.
As you say you can work on different layers to achieve what you want or another way of doing this would be to draw a polyline for the needed contour and add extra lines where needed afterwards!
You could also use the Modify > Divide tool to edit things but this would take time to do...no, I think for me I would use a polyline or an extra layer.