I'm not sure I follow you. Are you talking about bridging comb from the queen cells to the comb on the frame either side of the cell bar frame? If so, no it hasn't happened. This frame was actually sent to me by mistake several years ago with an order and they told me to keep it. It is painted purple on the top and is quite narrow. I used to use the Jenter system which used a normal width top bar. Many of my cells bars looked like the attached picture above. Yeah, I cut and tore comb away from the cells as best I could. After I started grafting I started using the narrow bar and I have much less comb attached to the cells....Do you have any problems with the bees attaching the cells to the combs on the side?