Yeah, I don't think it's thought of as a bug so much as a normal part of how collections work. And it's easy to avoid by just not putting your work in collections, or pre-vetting collections to make sure they're not anonymous - I mean, I don't usually AS SUCH, but I also like to click through and see what else is in the collection my work is being added to, so I would notice if everything was anonymous. You can easily take it out again. So I don't think it's something that is particularly high on their radar to address and might never be.