`filled()` doesn't work as expected

[pragmaticpandy]

What version of OpenSCAD are you on?
2024.04.12 (git dfa7855cf)

Describe the bug
using filled() with dsa results in the stem being filled in as well. I expected the stem to not be filled in so the key is still usable

To Reproduce

translate_u(x,y) dsa_row(3) dishless() filled() upside_down() key();