Can respawn mid-air with default spawnpoint

{*}{*}Players can respawn mid-air with default spawnpoint when blocks under spawnpoint removed.

This issue happens since 24w20a.

Steps to reproduce:

1.Create a default world. (eg. Use the seed:12, which default spawnpoint is at (-32,72,-32)

2./kill and respawn. (Due to MC-272333, the respawn point is always at the same X and Z coords)

3. /fill ~ -60 ~ ~ ~-1 ~ air

4./kill and respawn.

Observed result:

You will spawn midair and fall. (In survival mode, if the fall time is longer than 3s, you will die again)

Expected result:

You will spawn at the bottom (y:-60)

Notes:

Relates to MC-272333 and MC-272369(fixed)

In 1.21-pre1, you will spawn 1 block above ground if blocks under default spawnpoint not removed, this is also different from 24w19b and before.