When I updated my Bedrock Minecraft app and started my survival world, all was fine and dandy, until I noticed that I saw mobs spawning in groups, usually about 4 of the same mob. It looked fine and all but there was something off, they mobs were spawning in the exact position as the other ones. I recently checked the new features of 1.16.0 and I saw that group spawning is now a thing (don't know if they were before the update). Usually, a mob would either spawn by itself or with another of its kind just a few blocks away from it, but like I said before the mobs were spawning in the same position. This only seemed to happen with new mob spawns. Once they spawn they push each other out of the way like it should and everything goes back to normal.