When "extra" is set on a wall in a map, "extra" field of wall struct evaluates to -1
Setting extra
on a wall (alt-m in mapster32) and then attempting to retrieve it in CON script fails (evaluates to -1). The extra
value in the map persists across mapster32 sessions, but is not accessible to CON.
Setting the extra
field from CON and retrieving it again works properly.