Schematic SVG images plotted in color when asking for black and white

Description

In eeschema when choosing the File | PLot menu and selecting SVG format and monochrome the images remains in color. They should be greyscale like in the case of PDF and PS format.

Generates:

Here is the test case I used: test.zip

The same problem can be reproduced using kicad-cli sch export svg --black-and-white test_v5.kicad_sch

KiCad Version

Application: KiCad Schematic Editor

Version: (7.0.0-62-g187947e8d8-dirty)-78+g3b5c38d861+deb11, release build

Libraries:
	wxWidgets 3.0.5
	FreeType 2.10.4
	HarfBuzz 2.7.4
	FontConfig 2.13.1

Platform: Debian GNU/Linux 11 (bullseye), 64 bit, Little endian, wxGTK, gnome, x11

	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.74.0
	OCC: 7.5.1
	Curl: 7.74.0
	ngspice: 34
	Compiler: GCC 10.2.1 with C++ ABI 1014

Build settings:
	KICAD_SPICE=ON