Getting the value of taxonomy field in a node.html.twig template (Drupal 8.x)
I found the problem. The 'news' field is a multi-value selectable field. The correct way to access the field would be:

{{ content.news.0 }}


Of course, this will only print the first value in the collection, so I created a for loop in the twig template to loop over the different values.

I needed the 'title' and the 'url' of the taxonomy term. This could be retrieved by:

{{ content.news.0['#title'] }}
{{ content.news.0['#url'] }}