Dragging/PNS via ignores connected tracks (disconnects them)

Description

Dragging a via seems to ignore connected tracks on some layers and does not drag them along. Same happens when the router pushes/shoves other vias around -- they get disconnected.

KiCad Version

Application: Pcbnew

Version: (5.99.0-2694-g4afb2bf0c), release build

Libraries:
	wxWidgets 3.0.4
	libcurl/7.66.0 OpenSSL/1.1.1g-fips zlib/1.2.11 brotli/1.0.7 libidn2/2.3.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.4/openssl/zlib nghttp2/1.41.0

Platform: Linux 5.7.11-100.fc31.x86_64 x86_64, 64 bit, Little endian, wxGTK

Build Info:
	Date: Aug 12 2020 09:22:32
	wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.69.0
	OCE: 6.9.1
	Curl: 7.66.0
	Compiler: GCC 9.3.1 with C++ ABI 1013

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