To the Bethesda developers:

Bug: the pressure plate trap 64fff (player.moveto 64fff) at SoljundsSinkhole01 activates buggy invisible spears. For unknown reasons the game refuses to draw the spears. Nothing apparently wrong looking with the CK...
http://postimage.org/image/ar8g4ieuj/

Reproducible: always.
System: vanilla game 1.8.151.0.7, Steam PC.