Cannot edit 3d model offset in footprint editor

Description

When I click on edit footprint, 3D model settings, and I add a 3d model, I cannot set the offset and rotation. I need either to close the dialog and open it again, so that it works, or add a second empty model and delete it again, then it also works.

Steps to reproduce

1. Edit Footprint
2. Edit, Footprint Properties
3. Tab 3D settings
4. Click on Open icon
5. Select 3D step file
6. Try to add an offset, does not work
7. Click on add a new empty 3d model file (+ icon)
8. Click on delete this empty model
9. Now adding offset or rotation works in original model

KiCad Version

Application: ModEdit
Version: 5.1.5-52549c5~86~ubuntu18.04.1, release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.58.0 OpenSSL/1.1.1 zlib/1.2.11 libidn2/2.0.4 libpsl/0.19.1 (+libidn2/2.0.4) nghttp2/1.30.0 librtmp/2.3
Platform: Linux 4.15.0-72-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.22
    Boost: 1.65.1
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.58.0
    Compiler: GCC 7.5.0 with C++ ABI 1011

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=ON
    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_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON