This is an issue with the subterranean locomotor, which wasn't properly updated in RA2/YR, and thus, radiation and open-topped don't work correctly with it. Units in tunnels also use that locomotor and have to suffer from same issues/limitations.
This is an issue with the subterranean locomotor, which wasn't properly updated in RA2/YR, and thus, radiation and open-topped don't work correctly with it. Units in tunnels also use that locomotor and have to suffer from same issues/limitations.