EESchema - graphic lines disappear when attemting to move their vertices

Description

If I try to move vertices of rectangle drawn with graphic lines you get some weird disappearing act.

Steps to reproduce

1. Draw a rectangle with graphic lines
2. Move line vertices several times

KiCad Version

Application: KiCad

Version: (5.99.0-6939-g8ec0cef572), release build

Libraries:
	wxWidgets 3.0.5

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

	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8)
	Boost: 1.73.0
	OCE: 6.9.1
	Curl: 7.71.0
	ngspice: 32
	Compiler: GCC 10.2.0 with C++ ABI 1014

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