Items glitch when dropped, stiff walking.

If you break a block then drop the block it falls repeatedly till it finally hits the ground. Then you can’t pick it up for a few minutes or so. This happens when you drop an item in your inventory too. Also other characters movement becomes stiff and they don’t have the walking animation. Any mobs, like bees and zombies for example walk like one single step at a time, pausing for one or two seconds before moving closer.