I opened my reserve once at repack time, and out fell one of those cushioned plastic clamp tips. My rigger had it come off inside my pack, and either didn't notice it missing, or noticed but didn't bother to look for it inside my pack job. Hard to see how it could cause a malfunction, but it doesn't inspire confidence that such a thing could happen.
And once that tip comes off, is the rigger now using those bare metal sharp edges on other canopies? Eeek!