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The idea of trying to favorite in the web UI should have come to my mind before :-), now I suggest to close this question as "norepro" - I'd rather not delete it, because somebody might benefit.
@nicael both SE apps got something known as "beta" version which is updated much more often, and used to test for bugs. If you don't know what I mean it's fine, and means you're using the stable release. (i.e. downloaded from Google Play)
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