entities in a small area lags game when you go by them (video link in description)

when ever you go near entities in a small area for example a cow far it lags the game

here is youtube video of bug (https://youtu.be/fgF9RIzOtHgI)

(update) https://youtu.be/hT2buYQdCCM this was the problem i first had i had a pig farm and every time i would open fence gate an walk through it would lag i decided to remove my pig farm an make a cow farm instead of using fences an a fence gate i used blocks but i still had the lag the lag in my first video was probably caused from the wheat bug.