Soul Core Drop Sound

It seems walking onto the same "tile" as a medium soul core (I think it works with the other soul cores too, only pieced together what was happening during the bit w/ medium soul cores though) will trigger the "drop" sound that occurs when a currency or other notable item (as determined by my filter) drops.

The reason I think this is a bug is because you can walk back and forth over the line where the sound triggers to repeat it constantly, and it was driving me kind of mad as I was exploring around and kept hearing these random currency drop noises with nothing to seemingly show for it.

Red X's are where the sound triggered, green circle is roughly where the soul core was.