[Breaking] Doors no longer open in Generator Room on Dr Splice's Lab Escape due to failed fill command

Verification builds: 1.6.0.0 - RC0, Beta 15 (980905)

Summary: In Dr Splice's Lab Escape (DSLE), once the user locates the lever to turn on the generator, the doors no longer open. The Command Block responsible for this is at `165 87 -152`, this executes the following command: `/fill -147 80 -166 -148 80 -166 redstone_torch 0 replace`.  This worked in previous live versions of the game.  Unfortunately, this now behaves strangely in this RC.

After investigating this, it seems like the Redstone Torches are being filled onto Air, which causes them to immediately break.  This is very strange because the working version of the game which is live had some blocks which the torches are added on top of.  It would seem that these blocks are potentially missing in this build of Minecraft.

Impact: The Redstone Toches were previously filled onto two blocks which triggered a Door to open. Since the torches cannot be placed, the doors do not open and the player is stuck in the Generator Room and can no longer continue to play DSLE.

Repro Steps:

1. In DSLE /fill -147 80 -166 -148 80 -166 redstone_torch 0 replace
2. Notice the torches appear but break immediately. 

Observed Results: The fill command works, but the blocks under where the fill takes place are missing in this world.  We are unsure why these blocks are missing, possible world corruption?

Expected Results: The torches should be filled on the two blocks which will trigger the doors to open.

Screenshots/Videos attached: No

Environment: W10