missing connection with multi-part components in different hierarchical sheets (lp:#1846803)

Original report created by Eberhard Seibel (cantor53)

First, attached is the reference project test.zip.
Kicad shows a strange behavior when creating the connections (netlist)
between eeschema and pcbnew. In the identical hierarchical drawings "LED"
on sheet T2.sch is in each case a part of a multi-part IC (here 74AUC2G00).
Now the netlist visible in pcbnew:
In pcbnew only part B is connected. As an example, sheet Led0 and
sheet5D88809D show the two related parts of U2. Port "P0" associated with
sheet "LED0" is connected to part B of U2 used in sheet "sheet5D88809D"
instead of part A to "Led0". The output of U2B is again connected to the
component R3 from "Led 0". The connection "P3" has disappeared.
This behavior seems to be related to splitting a multi-part IC into
multiple designs. (As a counterexample, see the wiring of U6 in sheet T2.)

Application: KiCad
Version: (5.99.0-189-gc3175b45a), release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.61.1 OpenSSL/1.1.1 (WinSSL) zlib/1.2.11 brotli/1.0.6
libidn2/2.0.5 libpsl/0.21.0 (+libidn2/2.1.1) nghttp2/1.34.0
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian,
wxMSW
Build Info:
    Build date: Oct  2 2019 21:03:53
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8)
    Boost: 1.68.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.61.1
    Compiler: GCC 8.2.0 with C++ ABI 1013

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
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON

PS. Windows nightly build from Oct 3 2019 doesn't work.

Original tags: eeschema