I have found that to be true about pollen. And it's a pain in the butt when new beekeepers don't have any stored drawn wax frames. So their frames get pollen plugged, and they have to be replaced with new plastic foundation of which the bees take forever getting the wax started.
I know of another beekeeper that saves some of the pollen plugged frames for when pollen is needed, then scraps down the other plugged frames to where there is still just a little bit of wax on the foundation. This way the bees don't have to start building again on the plastic. I think it's a pretty good idea.