can't delete artifact with a plus sign in the classifier

I have some artifacts that I am able to successfully deploy and use as dependencies, but I can't delete them using the Nexus web interface, nor can I manually download them. This only seems to happen when the classifier has a plus sign ("") in it. e.g. "IA64N-HP-UX-g+".

When I try to delete the artifact, I get a popup that says "The server did not delete the file/folder from the repository". Trying to download it displays a page that says "The server has not found anything matching the request URI"

I'm attaching a sample shell script that uploads an non-deletable artifact. I tried this against a completely fresh install of nexus 1.8.0.
I don't see anything in the nexus.log.