Ammonites not included in Hoard: Scavengers quest

When Hoard: Scavenger quest activates for semi/aquatic playables, the quest list has Ammonites included. However, the ammonites items somehow do not count.

The actual ammonites, at least the one I found in Tallbrush, are not collectible despite the active server-wide quest.

Either the ammonite should be collectible, or the quest should exclude them from the list.