No item in foliage

No item in foliage appears when aiming at foliage or rocks that yield no item. Trying to pick it up makes it simply disappear.

Occurence

 * Crude Oil blobs in Northern and Southern Forests
 * Used to yield Crude Oil barrels while it was an item prior to Patch 0.3 alongside Crude Oil bearing plants
 * Some medium-sized rocks in the Dune Desert
 * As of Patch 0.4.0.0
 * Various rocks in caves
 * As of Patch 0.5.0.0 and more as of Patch 0.6.0.0