The bug
Upon entering the (freshly created) Debug World, it spawns you at y=2, but the blocks are at y=70. If you die, you still spawn at y=2.
This first occurred with snapshot 18w19a.
⚠️ Side note: Entering a world with Void World preset will spawn you at y=0 (MC-130523) even if you entered a higher air block number.
Linked issues
is duplicated by 2
Attachments
Comments 10
Confirmed for 1.13pre4.

Can confirm in 1.13-pre5.
Confirmed for 1.13-pre6.
Confirmed for 1.13-pre7.
Confirmed for 1.13-pre8.
Confirmed for 1.13.
not Confirmed for 19w08a
It's still in 19w08a.
Can confirm in 20w51a.
Can confirm for 1.13pre3.