When in spectator mode you can fly through the ground and under void and through mountains and trees, etc.
MC-46574
Bug with new snapshot
Resolved
Works As Intended
0
The report you have submitted is working as intended, mechanics of the game may change between updates. Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
For more information see: Full Version History or Snapshot Version History.