Describe the bug
Make sure to include:

1. What did you expect to happen?
   I expected the Bloomery Hatch to remain attached to its structure.
2. What actually happened instead (i.e. what was the bug)
   A layer of snow appeared in the cavity of the empty bloomery, and the bloomery hatch dropped as an item on the ground.
3. If it was a crash, upload the full log file (latest.log)
4. If they would help to explain the issue, include screenshots

To Reproduce
Attention to detail is important!

1. Do '...'
   Create a valid bloomery, keep it empty of ore.
2. Then do '...'
   Wait for snowfall to place a layer in it.

Meta Info

• TFC Version: 0.26.4.94
• Were any other mods included? Can you reproduce it without these other mods?
  No, vanilla TFC
• If necessary, what other mods (including versions) MUST be present to experience the bug?

Just saw this happen with snowfall onto a 8 charcoal stack behind the bloomery. v98 test server.