Last night I was in the frontier on SMP9 doing some mining . As I was working I was monitoring my progress and location on Dynmap. Shortly after I signed off I was also about to close my browser when I noticed some very unusual activity occurring on Dynmap.A very large unexplored area of the map was revealed quite rapidly within just a couple of minutes. It is roughly triangular in shape and can be more or less defined by the coordinate sets (67432, -4296) (80664, -4016) (75344, 2064). In addition, the newly mapped terrain seems to have been altered in some fashion with readily visible patterns of lines on snowy terrain and trees. See the pictures below.What could have possibly caused this to happen? Nobody could have explored such a large area that rapidly. And why are all the newly visible biomes altered?