Ok so i don't think its really a bug but i think it should be fixed.

if you place a slime block at the last bedrock level ( y 1) no matter how high up you fly if you land on the most you can bounce back up is like 60-70 i flew up to about 6k and dropped and I bounced to somewhere between 60-70 i think you should fix it so that the height you bounce back up is relative to how far you dropped like say you bounce back like 1/3 of the height you dropped not necessarily that but that was an example

thanks for your time i understand if you don't or cant fix it i just hope you can i think it would be fun - a Minecraft enthusiast