Originally posted by Malacar: As far as I understand, this is not a bug, but a design decision. Most charged attacks can't be cancelled into block, but with some weapons this is also true for light attacks. These are mostly massive weapons (glaive, two-handed hammer, two-handed axe). I think this is meant to reinforce the feeling that the weapon is big and powerful but unwieldy.

Spot on as usual Malacar.