Session problem with the smartphone app

[mhilbert]

The smartphone app stores user sessions permanently even if you explicitly use the logout button.

1. I log in to ILIAS via the LearnLoc app the first time using my account testuser123. I find my learning location courses and can work with them. Everything's fine!
2. I use the logout button in the account tab of LearnLoc app. On the tab "learning locations" I find the information that I have to log in first. Everything's fine as well!
3. I log in to ILIAS via the LearnLoc app on the same mobile device using an other account testuser666. But on the tab "learning locations" I find again the learning location courses from testuser123. Not fine anymore!

A reload is useless here. Closing the app or clearing the cache of the LearnLoc app also will have no results. There the learning location courses from testuser123 still appear. The session of testuser123 seems to continue to be active, although I have logged out and apparently logged in with an other account again.
The perfidious is the fact that the account testuser666 must not exist. Here, I can enter any string as user name and password and get the message "You are already logged in.", and can access the courses of testuser123.
The only thing that helps is to delete all data of the app via the app settings in the device settings of the smartphone, or to completely uninstall and reinstall the app.

Tested with:
ILIAS 5.0.11, LearnLoc plugin 2.2.4, LearnLoc app 1.0.5 for Android