Depends what you call a bug, but this is a missing feature.
Wrecking ball has technicly 3 abilities (Loose from his pile dive).
Ability 1 >> Transform
Ability 2 >> Shield
Although, transform is a bit more complicated. Its under the same button and shares the same name. Yet this is not 1 ability.
Transform from Standing to Ball is Ability 1.
Transform back, from Ball to Standing is Ability 3.
It does not respond to ability 1, codes nor does the ingame custom settings of disabling ability 1 stop hammond using ability 3.
Please add an ability 3 option or change it so both transforms fall under ability 1!