When A Jockey Using His power and he becomes Tank He have the power till he dont stop if he continously using his power then he will have power or else if he once stopped drag then he will not be able to use power
Thats not a bug. The Mod cant handle this things in the self moment. Its not a bug, but i think its good that u can finish your powers as Jockey before you lost it about Tank. So this is not an Bug. My Swarm Scripter maked the mod like this.