I can confirm this bug; it needs a bit more detail.
The basic sword and basic hammer in particular have an incredibly difficult time detecting collision with any form of spawned cube creatures. This includes single-button-press events, long-hold button press events, and combos. If the player character is directly pressed up against the creature, SOME attacks collide with the spawned creature.
The jump-attacks of each weapon with AOE do impact the spawned creatures.
This has been the case since at least 28.00.