Chorus fruit and Enderman can teleport to outside the world border and into powder snow

This issue relates to MC-102836.

That is a feature, not a bug. Mobs can go through the border unlike the player.

@unknown, source?

Pixdo.et, enderman going outside the world may be intended, but chorus fruit teleporting you outside is definitely a bug

Can confirm in 21w05b.

I am able to confirm this behavior in 21w38a. Here are some extra details regarding this problem.

The Bug:

Endermen and chorus fruit consider blocks outside of the world border as valid teleporting locations.

Steps to Reproduce:

• Set the center of the world border to your current position and to 10 blocks wide.

/worldborder center ~ ~
/worldborder set 10

• Obtain some chorus fruit and eat it until you end up outside of the world border.

• → ❌  Notice how chorus fruit considers blocks outside of the world border as valid teleporting locations.

• Summon an enderman and make it teleport by placing some water nearby.

• → ❌  Notice how endermen consider blocks outside of the world border as valid teleporting locations.

Expected Behavior:

The expected behavior would be that endermen and chorus fruit consider blocks outside of the world border as invalid teleporting locations.

Can confirm in 1.18.1.

Can confirm in 1.18.2.

Powder Snow is also not considered when checking for valid teleport destinations. (See MC-252243 for more information.)

Can confirm in version 1.21.6