Visual Bug when Item drops in mine

[desert thorn]

When Items that are not stone/coal/ore drop in the mine there is a sphere of darkness for about 1-2 squares
This happens for any and all mining drops - fossil nodes, geodes, gems, etc.

update: tried testing in other mines

water mine - it didn't replicate.
dropped node, geode water, water essence - no replication

air mine - didn't replicate
dropped node, mystery geode, air essence

I am going to test this in the fire.