You can set your spawn point inside dangerous blocks

Using a bed or respawn anchor, you can spawn inside or onto the following blocks:

• Cactus
• Campfire
• Fire
• Lava
• Magma Block
• Soul Campfire
• Soul Fire
• Sweet Berry Bush
• Water
• Wither Rose

Players can be trapped forever if they continuously spawn in a water/lava chamber completely surrounded in certain blocks.