When pulled by a piston a honey block(s) and a slime block(s) with any movable block in between will not join together and be pulled. In theory this should work as the two blocks are both attached to the same movable block, not each other (a video is attached). I apologize for the low fps / lag of the video, my laptop isn't designed for recording. Also, as seen in the video, when you hover over either a slime or honey block the selection box that appears around the block becomes transparent. I also apologize for the lack of video editing.