Graveyard, Omar 17 lvl. (Darkstone)

When passing this add-on in the land of Omar (level 17) with the help of Book of Magic Portals, we create a portal in the house where a lonely chicken runs (if you kill it, an elixir of strength drops out). But this portal is not working, i.e. inactive. How to make it work, i.e. move to level 17? There is the 5th crystal.
In addition, at the 28th level, where the last, 7th crystal is located, closed doors cannot be opened by the prism found earlier. The prism itself approaches the lock, disappears when clicked, but the doors do not open. This prism is not detected in any way, when you hover the cursor on the door, no messages pop up. It seems that the work on Graveyard has not been completed.