Elytra flying bug

Soo i was just flying in The End looting and searching for some elytras when i noticed that sometimes i get bugged and i can go through some blocks like i filmd on this video:  https://youtu.be/Sjh98pCx5AM  sorry for the lag in some parts of the video. As you can see in the first part of the video nothing went wrong and evrything was normal, after a while i used the elytra once again and then i started to go through blocks and stuff i dont know how it happend but i got it on the record soo i hope that'll help with the bug fix!