Since a few days the recent added pokestops are removed and not shown anymore while playing.
They still show up in the system and they seems just disappeared now
If you mean you still see them on the Ingress map, that no longer updates with Wayspot changes since the split from Scopely.
The best tool we currently have is the nomination map screen. Turn the toggle on and it will show you other existing Wayspots (or imports for Powerspots) that are not being used as stops or gyms. It only works while you are right there, though, so you can’t check remotely.
We have seen many reports of similar Wayspots being removed.
My guess is that the title is inaccurate because this is a route marker not a “Knooppunt” how you call them and they got removed because of that. The other obvious reason is that they were reported by someone.
Do keep in mind that PoGoMap is a user-generated map, not one provided by Wayfarer or PoGo, so it may not be the most accurate. Right now, since the split from Ingress, we don’t have a map that is reliable to use. I’m a bit surprised that the links haven’t been removed, because I believe that they aren’t allowed per the forum guidelines.
If these are actually removed from PoGo, the best way to know would be to go to the locations or ask someone that goes there often to check. If they indeed have been removed from PoGo and you believe they should be restored, you can do so in the Wayspot Appeals topic.
Another issue could be that there are other Wayspots in the L17 S2 cells that now are stops/gyms in PoGo. Sometimes this can happen if there is an edit, especially a location edit, done to a nearby Wayspot, and this could cause a rebalance of the map. Again, hard for us to know due to the split.