Grounded while in the air and fish not making ground contact when flopping

When flying, i hear footsteps on the ground (can only hear if around 3 blocks away from the ground) and can only run as fast as i could if i were grounded. This only happens if I move while flying in the air at any height after staying idle for about roughly five seconds. I have tested this prior to this report and it has happened each and every time while at any height above any blocks including liquids etc. And also minor bug but when fish flop they do not make contact with the ground.