For a few days now I’ve noticed that, at least in the experimental builds, cutting, piercing, rifle, and pistol XP cannot be gained from anything but books. In the case of cutting and piercing, the xp all becomes bashing (even if bashing xp is disabled and the weapon does no bashing damage). In the case of pistol and rifles, the xp just seems to fall into oblivion. I have not tested marksmanship and archery, so, whoever looks at this, might want to look at those as well.
This occurs on the windows tiles build, and has been tested with the nailgun, cXstorm, katana, long string, knife spear, pointed stick (wood spear), Ruger red hawk, makeshift/stone knives, and the sword thing like a foil (I forgot the name, its the one that’s actually deadly and designed explicitly for stabbing).
Also, at least with melee, I can confirm that it says things like “cut” and “pierce” in the attack description, despite no such xp being gained.