Player spawned in incorrect location on world reload

Exiting the world in/near certain blocks or entities cause the player to spawn in an incorrect location when reloading the world.

Saving while in a boat caused me to respawn on the shore/bottom of the ocean, about 30 blocks away.

Saving while standing in the same block as a glass pane or fence post caused me to respawn on top of my house (same X,Z coordinates)