Map room on pillars disappears after server crash

Game mode: [Online]
Problem: [Bug]
Region: [America]

Issue on a friend’s private server (MightyServer)
Twice recently I had built a circular map room on stilts (pillars) on the roof of my existing building. Both times when the server crashed, I logged back in and the pillars and circular ceiling tiles were missing.

The first time I built was just prior to 1.10. The server was down when the patch happened, so I figured it could have been a rollback or foundation collapse. I checked with the guy who owns the server and he did not see anything in the logs that would indicate a problem.

I rebuilt after the 1.11 patch and ended up with the same result. Only the pillars and circular ceiling tiles were gone. No other tiles missing to the existing building, and changes made just prior to construction were still there. Prior to rebuilding, I fortified the structure of my building to make sure it didn’t collapse from a poor foundation. Most of the ceiling tiles I put the pillars on were showing 80-100 stability. I believe there was one tile at 60 stability, but it did not have a pillar attached.

Steps on how to reproduce issue:

  1. Build a circular ceiling on stilts on the roof of an existing building. (Two stacked pillars per column, Plenty of pillars for stability)
  2. Restart a crashed server.
  3. Observe only the pillars and circular ceiling tiles missing.