Explosions from beds and respawn anchors can't be blocked by shields

Beds and respawn anchors can explode and inflict damage to the player even when blocking with a shield. Tested with another player. Relates to MC-188247.

How to reproduce:

1. Create a world on a server with a friend.
2. Go to the nether or the end and place a bed.
3. Get a shield and set your gamemode into survival.
4. Hold the shield blocking and tell your friend to right-click the bed.
5. The explosion damage isn't blocked.