The dragon flies through the bedrock

In the new snapshot in which the spawn eggs of the Dragon, Vizer, Golem and Snowman were added, I decided to spawn the dragon, after which it began to spin in 1st place, and when the Dragon reached half of its health, it, as usual, began to move towards the center of the world, that is, 0 0 0, when reaching coordinates 0 1~2 0 he, as expected, remained above the first block of the bedrock, since he could not destroy it, and after 15 seconds of circling over it, he abruptly teleported under the bedrock and began to fly in the void