[MC-130098] Debug world spawns player at y=2 instead at y=70 where all the blocks are

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

Panda4994 2018-06-21T16:07:37Z

Can confirm for 1.13pre3.

Panda4994 2018-06-27T18:29:50Z

Confirmed for 1.13pre4.

qwerty23495 2018-06-30T04:42:24Z

Can confirm in 1.13-pre5.

Panda4994 2018-07-04T17:55:53Z

Confirmed for 1.13-pre6.

Panda4994 2018-07-13T10:39:12Z

Confirmed for 1.13-pre7.

Panda4994 2018-07-13T21:47:10Z

Confirmed for 1.13-pre8.

Panda4994 2018-07-20T15:57:56Z

Confirmed for 1.13.

Pig2Creeper 2019-02-20T20:55:02Z

not Confirmed for 19w08a

Meri Diana 2019-02-20T22:29:26Z

It's still in 19w08a.

Avoma 2021-01-13T14:03:59Z

Can confirm in 20w51a.