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:
  
  

encounter_3

• has a missing chiseled tuff brick:
  
• has a hole:
  

encounter_4:

• has a 2 block tall dripstone: