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PCBNew 5.99 : wrong gerber solder mask

Description

I absolutely cannot understand why pcbnew generates the wrong solder mask. I tried in every way to make sure that it saves the gerber file of the solder mask with the rectangular aspect around the rectangular fiducial mark. I checked the file with gerber viewer then for safety I tried on https://tracespace.io/view/ but without success, it is always round despite being correctly displayed by the pcbnew editor and by the 3d preview

solder_pcb

OK

sm_3d

OK

solder_mask

Wrong

KiCad Version

Application: Pcbnew

Version: (5.99.0-3207-g147540b3b), release build

Libraries:
	wxWidgets 3.0.5
	libcurl/7.71.0 OpenSSL/1.1.1g (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.3.0 libpsl/0.21.0 (+libidn2/2.3.0) libssh2/1.9.0 nghttp2/1.41.0

Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Sep  7 2020 21:04:48
	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8)
	Boost: 1.73.0
	OCE: 6.9.1
	Curl: 7.71.0
	ngspice: 32
	Compiler: GCC 10.2.0 with C++ ABI 1014

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=OFF
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
	KICAD_SCRIPTING_ACTION_MENU=ON
	BUILD_GITHUB_PLUGIN=ON
	KICAD_USE_OCE=ON
	KICAD_SPICE=ON