Elytra lag and takes fall damage

I was playing and got full fall damage, due to a lag while i glide down with elytra i was not going too fast. i was just going down like with slow but a little bit faster than slow speed, and before i hit ground get fall damage i do that i look up and take no damage. but my game lagged and i died with full fall damage while had prot 4 and feather falling 4 and glided down from 40 blocks and that should not kill you from a normally jump down from that height.

Idk is it my computer's fault btw my spec is Ryzen 5 2600x six-core, Gtx 1050 Ti and 8gb ram i was on 16 chunk and i didnt had with this any lag or freezing.

If anyone knows how to stop this can i get some tips maybe?

(i looked up and i saw only elytra fall damage and those was old ones like 1.9 pre release)

my death message was saying (player name) Fell from a high place

sorry if it is a duplicate but i didnt saw in 1.16 having this problems