Node title not showing in snippet preview when creating new node.

When creating a new node it has the metatags filled in like this:
[current-page:title] | [site:name]

In Drupal 8 yoast snippet preview these tokens are directly converted to the real values, which results in an empty title.
When filling in the title it stays empty.

After saving it does show up, since you can see the metatags tab is still using the correct token, but if you would focus on the snippet it will override this also.