test-arcs.svg from comment #4 now renders so the circle does not go outside the hexagon. Please re-test.
Win 7 64-bit Inkscape 0.92pre1_64bit r15044
test-arcs.svg from comment #4 now renders so the circle does not go outside the hexagon. Please re-test.
Win 7 64-bit
Inkscape 0.92pre1_64bit r15044