Can't Instant Build Ladders

Summary:
Hearhtlings were stuck so I tried to ib a ladder for them. Discovered an error.

Steps to reproduce:

  1. Place ladder.
  2. Open console.
  3. Try to “ib”.

Expected Results:
Ladder poofs into existance.

Actual Results:

Notes:

Attachments:

Version Number and Mods in use:
Release-524 (x64)

System Information: