In the preview mode the non-existent pages are blue (see the picture) on huWiki, but they should be red. An example: Kanda Szajaka (on enWiki Sayaka Kanda) doesn't have an article yet but the links are blue on the picture.
Topic on 2017 wikitext editor/Feedback
Hey there; this is https://phabricator.wikimedia.org/T153535, and we'll get around to it soon.
Thanks!
@Jdforrester (WMF): It's ok now. Thanks your cooperation!