Hearthlings refuse to mine a specific zone

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Summary:

Steps to reproduce:

  1. Mine a zone
  2. Mine under it from the center of the zone

Expected Results:
Hearthlings mine a specific zone

Actual Results:
Hearthlings refuse to mine the specific zone

Notes:

Attachments:
savegame
1467227695252.7z (3.3 MB)

Version Number and Mods in use:
dev-3023

System Information: