Respawns in the air when respawn radius is set to 0

If the radius of the respawn point is set to 0 in the world settings, the respawn point is in the air and players may take falling damage.
Steps to reproduce:.
Step 1: Set the respawn radius to 0 when creating the world.
Step 2: Create the world with any seed value.
Observed results:.
Some seed values spawn in the air and take fall damage.
Expected result: the world will spawn in the air and take falling damage, no matter what the seed value is.
Spawn on the ground, no matter what the seed value is