Latest build 1.0.167.

Guys, how to place pendants at the altars???

I`ve solved the riddle with burial mounds, killed two enemy NPCs and collected two pendants.
Now I must go deeper underground and place these pendants at the altars just before arks with forcefields to proceed through them.

I`ve found altars - these pillars 1.5 meters in height circled by candles.
But I cannot place pendants! By dragging and dropping them from inventory I only succeeded in dropping them on the ground, not at the top of the pillars!

Placing the mouse holding the pendant over the top of pillar results in message "There is not enough space".
Seems that the top surface of the pillars is not valid surface for placing any items.

And these pillars did not selectable.

How the hell it is supposed to manage? To place pendants at the altars?

Is this a bug, or I`am just doing something wrong?