DRC: "inside" does not merge shapes of second input

[klayoutmatthias]

inside.gds.gz

See attached GDS file.

The following script does not render the right results for the first line:

# wrong - no output
input(2, 0).inside(input(1, 0)).output(100, 0)

# correct - with output
input(2, 0).inside(input(1, 0).merged()).output(101, 0)

The issue is not seen if the shapes of layer 1 overlap.