After pressing the Button the App hangs:
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Thanks. I did not find the related Bug as I searched for "ListenableFutureTask".
The related bug is pretty old (07/Sep/14). Can you force solving it?
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-71357. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.