Slice And Dice bug?

So I haven’t played rogue since wotlk, and i noticed now in the pre patch if i have Slice and Dice active for lets say 30 seconds, it can be overwritten if i use it with 1 combo pts, having it refresh to 12 seconds. This seems like a massive bug, as it has in the past expansions given a message saying " A more powerful spell is active" or something like that.

Sorry, this goes beyond my brain capacity, and BlizzGPT’s capacity.