General directions

• Create a custom class in your description.ext.
• Set a value of some sort within the class.
• Try to fetch the value with getMissionConfigValue.

Specific example

• Add the attached description.ext to a mission.
• Go ingame and type the following in the debug console:

hint format["Value: %1", getMissionConfigValue "CfgAutodoor" >> "Vehicles" >> "Land_Airport_side_base_F" >> "doorList"];

• Observe as it displays something like this in the hint dialog:

Value: 02558CB8

For the sake of readability, I've added the example description.ext I use as an attachment rather than pasting it here.

The following excerpts from the BIKI is what makes this seem like incorrect behaviour:

• "Returns value of given scenario attribute from the 1st tier."
• "Return Value: Number, String or Array, depending on the attribute value type. Nil when the attribute is undefined."

Currently, in order to get the value you still have to fall back on the old getNumber/getText/getArray commands combined with getMissionConfig.