Not actually sure if this is a bug or intentional:
When one person is mining a node, another miner can come up and begin tapping the same node. Before, the second person would receive an error at the end of their channel saying the object was already being used. Now, however, that second person is able to actually loot the node, even if someone else is already tapping it, or even looting it. It has actually kicked me out of a loot window before when someone else quite literally stole the object I was about to click.