You guys made me curious so I tried custom battles with all the 2 handed weapon infantry against hobilars. In every case the hobilars allowed the infantry to charge them. Even tried loose formations to see if they needed more room to swing their weapons. I can confirm that all the axe, polearm, billhook and club wielding infantry will not attack cavalry the only damage they can do is from charging. However pikes, halberds and 2 handed swords will do just fine. I was slightly confused at first because they did a few casualties during the fight until I noticed that the general was the one killing them with his sword. I certainly hope that this will get patched soon.