ERC wrongly classifies global labels as unconnected

Description

I use global labels to have the possibility to check for unconnected points in the schematic via ERC.But the checker keeps reporting labels as "not connected anywhere else" although they actually are connected. Pls. see attached screenshot.

Thank you very much for your work.

Greetings from Dominik.

KiCad Version

Application: Eeschema

Version: 5.99.0-unknown-5d47d699106ubuntu20.04.1, release build

Libraries: wxWidgets 3.0.4 libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3

Platform: Linux 5.7.8-050708-generic x86_64, 64 bit, Little endian, wxGTK, xubuntu, x11

Build Info: Date: Dec 21 2020 10:21:25 wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24 Boost: 1.71.0 OCC: 7.3.0 Curl: 7.68.0 ngspice: 31 Compiler: GCC 9.3.0 with C++ ABI 1013

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