mobs

umm i found a bug in guardian mobs dat they should be fish like but when i spawned them in super flat ocean type then they were like umm flat cubic thingy lika...u know....and i was terryfied casue the elder guarding mob look like a rly bad thing....yea...pls fix dis problem..and oh i forget something its happening when u create the world for the first time or u load the chunks for the first time..or maybe its my computer..idk.....