App crashing after signing QtWebEngine

[paco_edwin]

Hi,
For the last 4 days I've been trying to publish my app in the apple store (which I've never done before). In it I use qt 5.12.1 with qtwebengine. But I really got stuck with sandboxing webengine because after sandboxing app won't even start. I followed this https://mediaarea.net/blog/2018/02/14/QtWebEngine-MacAppStore initially without recompiling and changing webengine but afterwards doing this as well (Unsuccessfully though 'cause they used qt 5.9). I tried as well suggestions from this thread https://forum.qt.io/topic/102212/qtwebengine-signing-issues/4 and today https://forum.qt.io/topic/49250/solved-qtwebengineprocess-not-working-in-sandboxed-application but had no luck. So I thought maybe you guys could give me some tips on how could I do this. Prior to that I posted same question on stackoverflow there is all relevant information https://stackoverflow.com/questions/58053883/sandboxing-qtwebengine-for-apple-store
(Hope it's ok to attach link on stackoverflow)
I've changed script little bit since then. So here how it looks right now. Plist and entitlement are the same.

echo SIGN PACKAGE
# special case for QtWebEngineCore

find dist/MyApp.app -name Info.plist -exec plutil -replace CFBundleIdentifier -string "com.MyApp.desktop" {} \;

find dist/MyApp.app -name _CodeSignature -exec rm -fr {} \;
find dist/MyApp.app -name "*.dSYM" -exec rm -fr {} \;

#codesign -force -s "3rd Party Mac Developer Application: MyApp (*)" -i "org.qt-project.Qt.QtWebEngineWidgets"

#codesign --force --verify --verbose --sign "3rd Party Mac Developer Application: MyApp (*)" --identifier "" --entitlements app/webengine.entitlements  dist/MyApp.app/Contents/Frameworks/QtWebEngineCore.framework/Helpers/QtWebEngineProcess.app
codesign --force -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.desktop" dist/MyApp.app/Contents/Frameworks/QtWebEngine.framework/

codesign --force -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.QtWebEngineProcess" --entitlements app/MyApp.entitlements  dist/MyApp.app/Contents/Frameworks/QtWebEngineCore.framework/Helpers/QtWebEngineProcess.app

codesign --force -s "3rd Party Mac Developer Application: MyApp (*)" -i "org.qt-project.Qt.QtWebEngineCore" dist/MyApp.app/Contents/Frameworks/QtWebEngineCore.framework/

for f in $(find dist/MyApp.app/Contents/Frameworks -name '*.framework' -type d)
do
    if [ $f == "dist/MyApp.app/Contents/Frameworks/QtWebEngineCore.framework" ] || [ $f == "dist/MyApp.app/Contents/Frameworks/QtWebEngine.framework" ]; then
    continue
    else
        codesign --force -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.desktop" $f
    fi
done

for f in $(find dist/MyApp.app/Contents -name '*.dylib' -type f)
do
codesign --force --verbose -s "3rd Party Mac Developer Application: MyApp (*)" $f
done

codesign --entitlements app/MyApp.entitlements -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.desktop" dist/MyApp.app/Contents/MacOS/crashpad_handler
codesign --entitlements app/MyApp.entitlements -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.desktop" dist/MyApp.app/Contents/MacOS/MyApp
codesign --entitlements app/MyApp.entitlements -s "3rd Party Mac Developer Application: MyApp (*)" -i "com.MyApp.desktop" dist/MyApp.app/Contents/MacOS/MyAppUpdater

codesign --force  --verbose -s "3rd Party Mac Developer Application: MyApp (*)" --entitlements app/MyApp.entitlements dist/MyApp.app

After following codesigning app crash with the following message

LSOpenURLsWithRole() failed with error -10810 for the file /Users/edwin/third_party/publish/desktop_qt/dist/MyApp.app

To open it I use standard

open dist/amo.app

Any suggestions are appreciated because I've already wasted too much time on this and i miss normal coding.

Edit
If needed I can attach crash log that apple have sent me. I sent non working app to them. It just didn't have any issues in application loader so i thought it was fine. Then discovered that it is actually crashes because of webengine signature.