Encounters in trial chambers have missing/incorrect blocks

Hallway encounters have missing/incorrect blocks, some of these may be intended.

encounter_1 and encounter_2:

• have 2 incorrect tuff bricks in the ceiling:

  [media]
  [media]

encounter_3

• has a missing chiseled tuff brick:

  [media]

• has a hole:

  [media]

encounter_4:

• has a 2 block tall dripstone:

  [media]