I have used the Ionic 2 doc example yes. Seems to working just fine in the docs, but when I try to use in my app I get the bug descriped. FYI => I've tried the basic usage example and the example docs here.
I'll take a look in the topic you've linked. As for the bottom bar. I took my inspiration from the Ionic 2 doc example for the fab button. See here. As you can see the bottom button in the example also has a bottom toolbar.