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DRC error if overlapping pads have different pad number but same net

Description

In imported cadstar design, there are pads that form the "thermal relief vias" of a thermal pad. They have different numbers but are all associated to the same net in the schematic.

When running DRC on this design, a large number of "Hole clearance violations" are shown after running DRC. The expected behaviour is that no violations are reported because the items are all in the same net image

Steps to reproduce

  1. Run DRC on attached minimal design.

DifferentNumberPads.zip

KiCad Version

Application: KiCad PCB Editor

Version: (5.99.0-10160-g2b86b34124), release build

Libraries:
	wxWidgets 3.1.4
	libcurl/7.74.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 18363), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Apr  7 2021 00:04:59
	wxWidgets: 3.1.4 (wchar_t,STL containers)
	Boost: 1.75.0
	OCC: 7.5.0
	Curl: 7.74.0-DEV
	ngspice: 34
	Compiler: Visual C++ 1928 without C++ ABI

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