Eeschema: incorrect netlist created in some designs

In a few designs, the netlist is is incorrect (both when exporting the netlist and update PCB from schematic). the demo "pic_programmer" shows this issue

Steps to reproduce

• load pic_programmer demo
• run Eeschema
• Run Pcbnew
• update PCB from schematic
• have a look to U5 and U6 note also the errors can differ between 2 runs, but they are always related to U5 and U6

happens both on Window and Linux.

I am thinking thia issue was created by commit aa9e7449

Application: KiCad
Version: (5.99.0-1572-g73e1496b2), release build
Libraries:
    wxWidgets 3.1.3
    libcurl/7.65.1 OpenSSL/1.1.1c (Schannel) zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.39.1
Platform: Windows 7 (build 7601, Service Pack 1), 32 bit, Little endian, wxMSW
Build Info:
    Build date: May  7 2020 20:35:28
    wxWidgets: 3.1.3 (wchar_t,wx containers)
    Boost: 1.71.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.66.0
    Compiler: GCC 9.2.0 with C++ ABI 1013

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