Not sure exactly why, but worms completely ignore remotely driven vehicles currently.

Also, I'm not entirely sure, but I don't think rampant-controlled attack parties attack remotely driven vehicles, either. Normally spawned biters do. I am much less certain of this, but I have watched a rampant attack party run right past my remotely controlled tank. This isn't cripplingly bad behavior, except that they continue ignoring the remotely driven tank even when attacked, not counter-attacking.

Thank you. Fixed in the new release.