Disclaimer; yes I've marked this as answered, but I haven't linked an official answer to it and I can't find one to link to. If a unit is standing in Difficult Terrain, will Difficult Terrain reduce 1. Dodge distance? 2. Failed Guts Roll movement? Bonus question: Am I reading it correctly that movement resulting from Guts Rolls will not stop if a unit touches Difficult Terrain? https://infinitythewiki.com/Difficult_Terrain https://infinitythewiki.com/Dodge https://infinitythewiki.com/Guts_Roll
I don't think there's an official answer. In terms of non-official answers, I think this is the best answer so far: https://forum.corvusbelli.com/threads/dodge-and-second-mov-value.38633/#post-383846