Example project SingleTagField error "field is required"

[xtiansimon]

I installed the Example project as per instructions. I'm able to add 'Persons', but there is something wonky about the SingleTagField.

I've created this several times until I found a consistent pattern. In the example the SingleTagField (Mr or Mrs) visibly displays value 'Mr'. This gives you the impression it's already select/default. Next, add values for other fields. Finally, in admin click "save and add another" or on site homepage click 'Add'.

On the homepage nothing happens. In the Admin view we see an error on Title: 'field is required'. (see image below). I can avoid this error (and correct after error) if I click on Mrs., and then re-select 'Mr'.