Ore boulders are not syncing in MP. Drills glitch into them and surfaces don't show deformation
Fly to a surface boulder on a Keen server and try to drill it with a ship. The surface wont show visually that you drilled anything, however you are and you inventory is filling up. This drill also moves into the area you are drilling but also gets kinda stuck and sometimes gets violently pushed out. If you get out of your ship and walk to the are you drilled, you will walk through the visual surface and see inside where you drilled. This also sometimes happens when you are just hand drilling too. F5 usually fixes it and the surface updates and you stop getting stuck in it.