Actually as a 2-hander all 2-hander bugged units, (including billmen), are suopposed to be crap vs. cav anyway.

Even with a fix they are crap as a single formed cav charge will rip them to peices. Of course, if you can tie the cav down they slaughter them once fixed...

However the 2-Hander bug means everyone with a 2-handed weapon other than a 2-handed sword that does not use spearwall, is unable to attack cav at all, and is very poor vs. infantry. Eastern Halberd Militia and JHI are the only non-sword/spear wall exception to this.