Clone command sends outputs when it shouldn't

In the past, clone commands worked so that if a repeating command block was cloning one area onto another, the command block would only send an output if a new block was cloned.  Now, however, it sends an output no matter what. Conditional chain command blocks I had in many of the projects I've been working on rely on this feature, but now execute whether the clone command actually clones new blocks or not. Please help me fix this issue so my world can work again. Thanks.