blind and buried vias print on all layers

On a four layer board, blind vias from either side and buried vias print on all the copper layers. Plotting gives correct results. This was reported on the forum and I was able to reproduce it.

Application: KiCad (64-bit)

Version: (6.0.5-174-g00226cb0f2), release build

Libraries:
	wxWidgets 3.1.6
	libcurl/7.82.0-DEV Schannel zlib/1.2.12

Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Jun 14 2022 05:10:41
	wxWidgets: 3.1.6 (wchar_t,wx containers)
	Boost: 1.79.0
	OCC: 7.6.0
	Curl: 7.82.0-DEV
	ngspice: 37
	Compiler: Visual C++ 1929 without C++ ABI

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON