[1.1]Adding a floor with no cost makes ancient dangers spawn empty

[Sam_]

So my mod Tilled soil has an issue where ancient dangers spawn totally empty.

After some lengthy testing I found that if you add a floor with <designationCategory>X</designationCategory>, where X is any value, and the floor has either no <costList> or an empty cost like <costList><Steel>0</Steel></costList> then ancient dangers are totally empty.

They will spawn and give you the warning, but when you open them and the interior spawns there is nothing inside.