Android: Backing out of root window with exitOnClose false shows splash if child window closed programmatically

I want to use exitOnClose:false on my root window, so it will go into background and is not exiting. It works fine unless I close a child window with the homeAsUp back arrow.

Example:

var win = Ti.UI.createWindow({backgroundColor: "#fff",exitOnClose: false});

var btn = Ti.UI.createButton({title: 'open'});

btn.addEventListener('click', function() {

    var win2 = Ti.UI.createWindow({backgroundColor: "#fff"});

    var actionBar;

    win2.addEventListener("open", function() {

        if (Ti.Platform.osname === "android") {

            if (win2.activity) {

                actionBar = win2.activity.actionBar;

                if (actionBar) {

                    actionBar.displayHomeAsUp = true;

                    actionBar.onHomeIconItemSelected = function() {win2.close();};

                }

            }

        }

    });

    win2.open();

});

win.add(btn);

win.open();

Example video: https://migaweb.de/open_window.mp4

Steps to reproduce

• First three times I open the index and close it and open it again (was in background, seeing no splashscreen -> works fine)
• After that I open the second window two time and close it with the back button and then the index window, too (same, works fine)
• Last time I close the second window with the homeAsUp button and I end up at the splashscreen when I close the index. After that I ALWAYS end up at the splashscreen unless I kill the app

Tested versions:
Android 7
HTC A9
Ti SDK 7.2.0.GA, 7.3.0.v20180711185043

Expected behaviour
Always go to background and don't show the splashscreen when exitOnClose is set to false on the root window.