I noticed that also. Not alot of debris. Cluster munitions would make the are off limits.
Why would cluster munitions make it off limits? This is an emergency military operation. A small proportion of dud cluster bombs are an acceptable risk for military movements.
And the Russian civilians are probably clueless. There was a civilian Russian video yesterday of a civilian vehicle moving over a couple of lines of mines laid across a road. And by a wrecked civvie car that had probably run across one earlier.