Good, it seems we solved the bundle issue. Now it looks like you have a ZCA lookup problem, which cannot be related to JS bundling. I'm afraid I have no idea why the request has a wrong URL. Could it be a case of permissions in the vocabulary? Can you access http://localhost:8080/Plone/@@getVocabulary?my_theme.MyVocabulary&field=application_areas unauthenticated?
I think it's worth now to open a new thread and post at least part of the code that's generating the form. A repository we could clone and reproduce the issue, and a shorter thread, will increase the chances of other people jumping in.
Yes, correct: this results in the expected json for an anon user.
Thanks to both of you for the assistance so far. at PLOG? I feel much more comfortable tackling what looks like a ZCA related problem like you said, than working with mockup and js bundles. Will put some effort in this over the weekend...
Thanks again!!!
Edit to add a final datapoint: when I remove the conditional expression python: member is not None from the plone-logged-in bundle, the form elements display as expected. No results are found (because of the disallowed vocabulary query).
I ended up working around the problem by using RadioFieldWidget and CheckboxFieldWidget.
Meanwhile, I have generalized and separated my form related code from the rest of the project. Will make this package available on Github, as I expect that it could be very useful with the upcoming troubleshooting of plone.staticresources in the near future
at PLOG? I feel much more comfortable tackling what looks like a ZCA related problem like you said, than working with mockup and js bundles. Will put some effort in this over the weekend...
taste better 
Not sure I'll make it to PLOG, though.