Watching the launch of the Shenzhou-11 mission on a Long March 2F, I noticed a number of items falling off the exterior of the rocket. I'm used to seeing chunks of ice sheet coming off of cryogenic launchers, but Long March uses non-cryogenic hypergolic fuels, and the pieces were squared-off, clearly manufactured items. There were quite a few of them - at least 10 coming off the launcher in the first 20 seconds of flight. Here are a few screenshots showing the debris:
I don't see any similar items coming off in this video of Shenzhou-9 or this one of Shenzhou-10.