In 20w20b if you throw an ender pearl while falling it hits the player instead of throwing properly. I tested this in 1.15.2 and throwing ender pearls while falling works fine, it just does not work in the 1.16 snapshots. I personally experienced this during the end fight in a hardcore speedrun. I was thrown into the air by the dragon and when I tried to pearl to break my fall it hit me, and I proceeded to fall and die to fall damage. This bug can be easily reproduced by falling from a high place, and ender pearling while falling.