I've just come on here to ask this very same question! I was creating a very simple mode to add a workbench to dispose of the huge piles of corpses (I uploaded my mod here: http://www.nexusmods.com/rimworld/mods/32/? ) and couldn't understand why I couldn't get any interaction with a 3x3 building and radius 0,0,3
At least I know it's an issue with the current build, thanks for the help for those above as you've assisted me as well
At least I know it's an issue with the current build, thanks for the help for those above as you've assisted me as well