Issue: Breaking a bed that you set your spawnpoint in,does not reset your spawnpoint.

How to reproduce: Sleep in a bed (to set your spawnpoint). Break that bed. Then either die, or go through the end exit portal. (You will see your spawnpoint is still set to the bed you broke.)

How it should work: When you break a bed you slept in, your spawnpoint should be reset to the worldspawnpoint.
Update by Oval:
How to reproduce:

1. Set your bed 400~ blocks away from worldspawn.
2. Set an end portal at your bed.

   /setblock ~ ~ ~2 end_portal
   

3. Sleep in your bed.

   /time set night
   

4. After you wake up, go to the end and through the end portal (skip end credits).

   /kill @e[type=!player]
   

   → You respawn at your bed as expected.

5. Break your bed, and go back to the end and trough the end portal.
   → You respawn at your bed although you destroyed your bed.

From MCPE-40681