Copy paste from derived (previously known as alias) symbol behaves strangely

Description

Copy and paste of graphics within a derived symbol results in copying of the s-format text but not of copying of the selected graphic.

Steps to reproduce

Open any symbol in the official lib that was an alias in version 5. Example 1N914 from the Diodes library. Select the graphic elements -> ctrl+c -> ctrl+v Observe the nice S-Expression that you get from that. (As a text field)

KiCad Version

Application: LibEdit

Version: 5.99.0-unknown-r20801-e684c6d9, debug build

Libraries:
	wxWidgets 3.0.5
	libcurl/7.71.1 OpenSSL/1.1.1g-fips zlib/1.2.11 brotli/1.0.9 libidn2/2.3.0 libpsl/0.21.1 (+libidn2/2.3.0) libssh/0.9.5/openssl/zlib nghttp2/1.41.0

Platform: Linux 5.8.14-300.fc33.x86_64 x86_64, 64 bit, Little endian, wxGTK, cinnamon, x11

Build Info:
	Date: Oct 15 2020 17:41:19
	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.73.0
	OCC: 7.4.0
	Curl: 7.71.1
	ngspice: 32
	Compiler: GCC 10.2.1 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
	BUILD_GITHUB_PLUGIN=ON
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON
	KICAD_STDLIB_DEBUG=OFF
	KICAD_STDLIB_LIGHT_DEBUG=OFF
	KICAD_SANITIZE=OFF