When a player(survival mode) is standing in an Ender Dragon's hitbox, the Distance Flown statistic will rapidly increase.

In the attached video, The Distance Flown increased about 80km within less than a minute.

This is not a duplicate of MC-30542 because in this case players actually don't move.

Steps to reproduce

1.run /data merge entity @e[type=ender_dragon,limit=1] {DragonPhase:3} to make the dragon land.

2.When the dragon land, stand at the center of the dragon and switch to survival mode.

3.Open the statistics and note down the distance flown.

4.Waiting until the dragon knockback you, open the statistics and note down the distance flown again.

Observed behaviour:

The distance flown increased over 50 km.

Expected behaviour:

The distance flown don't increase.

Notes:

This bug happened since 1.9.

I think it's because the dragon always gives player a large amount of server velocity when they are in the Dragon's knockback hitbox even if the player don't actually move.