Content top region is not displayed

Content top region is defined in the info file, however the page.html.twig file misses the code needed to print out the region:

{% if page.content_top %}
  {{ page.content_top }}
{% endif %}

I see in Git that it was included earlier but was removed somewhere in the develeopmnet process and was not added back.

It is not clear if you want to fully remove it or you just forgot about it.

IMHO a "Content top" region is useful, but I suggest to place it above the content title instead of its original place so its behaviour would be more consistent. (And if someone wants to display a block under the page title she can use the "System help" or the "Content" region.)

By the way it seems that you are the first who provides a full Drupal 8 theme so congratulations and thank you! :)