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DRC reports clearance violation between track and zone

Description

When I run DRC on the attached board, I get a vast number of "Error: Clearance violation" items between tracks and zones. This is mysterious to me as the zones should be filled conforming to clearance, and I can't see any violation at the points the markers appear at.

Steps to reproduce

  1. Run DRC on attached board.

gfx.zip

KiCad Version

Application: Pcbnew

Version: (5.99.0-6737-g2c1b6e42e0), release build

Libraries:
	wxWidgets 3.0.5
	libcurl/7.73.0 OpenSSL/1.1.1h zlib/1.2.11 zstd/1.4.5 libidn2/2.3.0 libpsl/0.21.1 (+libidn2/2.3.0) libssh2/1.9.0 nghttp2/1.41.0

Platform: Linux 5.9.1-arch1-1 x86_64, 64 bit, Little endian, wxGTK, , x11

Build Info:
	Date: Nov  1 2020 03:30:23
	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.72.0
	OCC: 7.4.0
	Curl: 7.73.0
	ngspice: 33
	Compiler: GCC 10.2.0 with C++ ABI 1014

Build settings:
	KICAD_SCRIPTING=ON
	KICAD_SCRIPTING_MODULES=ON
	KICAD_SCRIPTING_PYTHON3=ON
	KICAD_SCRIPTING_WXPYTHON=ON
	KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
	KICAD_SCRIPTING_ACTION_MENU=ON
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON