After a few minutes of playing, there is no animation when I mine certain blocks (dirt and logs from a tree mainly). The item is dropped normally, but is not picked up by the player as normal, instead the items float one or two blocks up before floating down again, and only is then picked up. Another issue that occured after starting a world is the sun going down and then jumping back to noon, before sinking again. This is repeated, so it's not night for a long while. Also mobs behave unusually, moving very slow and when I try to hit them, the hit is delayed and the mob not reacting to it.