@ -414,6 +414,7 @@ def _subpatterns_to_refs(subpatterns: List[SubPattern or GridRepetition]
elif mirror_y:
ref.angle += 180
ref.strans = set_bit(ref.strans, 15 - 0, True)
ref.angle %= 360
ref.mag = subpat.scale
refs.append(ref)