Well, yeah, back when things were handmade or cobbled together at the last moment that stuff does happen.
I'm pretty sure that now that we've been to the Moon, we can tie a rope correctly, coat it with teflon if necessary, and design a trap door that opens when we pull the lever.
Some thick-necked small-headed death row bodybuilder is gonna slide right through the noose and take off running.
Just like my dog does with her collar. In a purely horizontal, unsuspended mode.