How to reproduce:

1. Set your spawnpoint using /spawnpoint x y z angle
2. When executing /kill, the player respawns with the spawnpoint's position & angle
3. Travel to another dimension (the_nether, end, or a custom one)
4. Travel back to the spawnpoint's dimension
5. When executing /kill, the player respawns with the spawnpoint's position but not with the chosen spawnpoint's angle