This page exists in English only

Switch to Dutch and you will not find it: it is left out of that menu, and its address returns a 404 there. A slug is an address, not prose, so it never falls back to another language — an untranslated page is simply not served in that one.

Open it in the panel and press the translate button to give it a Dutch version. Fifteen minutes after your last edit the reset empties it again.