Mining Z-level gets generated over on load #500
Description
Description of issue
Mining Z-level access areas (hallways and stairs) are generated over on load with cave generation.
Difference between expected and actual behavior
Mining areas set to ignore mining generation should not be generated over on load.
Steps to reproduce
Save the server, then load.
Length of time in which bug has been known to occur
Unknown, likely since Outreach map rework or #483