corner radius missing on step export

Description

The step export ignores the new "rounded corners" feature and exports all rectangles with corner radius == 0mm.

Steps to reproduce

  1. open attached project, open pcb: rectangle_corner_3D.zip
  2. File-->Export-->STEP . Export parameters see picture 3
  3. examine the produced step file with mechanical CAD package
  4. find only 90° corners on the rectangles, no rounded corners

step_export_02

KiCad Version

Application: KiCad PCB Editor x64 on x64

Version: 9.99.0-2945-g9dd642b66c, release build

Libraries:
	wxWidgets 3.3
	FreeType 2.13.3
	HarfBuzz 10.2.0
	FontConfig 2.15.0

Platform: Windows 11 (build 26100), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) UHD Graphics, 4.6.0 - Build 32.0.101.6129

	wxWidgets: 3.3.0 (wchar_t,STL containers)
	Boost: 1.88.0
	OCC: 7.9.1
	Curl: 8.13.0-DEV
	ngspice: 44
	Compiler: Visual C++ 1942 without C++ ABI
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_GB
	Enc: UTF-8
	Num: 1,234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)