Form under the "Unmanaged" tab in deployment's Replace dialog is in fact creating a new deployment. However after clicking on "Replace" button one would expect it to actually replace the content of existing deployment. I don't know if it is possible to replace "managed" deployment with "unmanaged" one but it should either do this (and behave like form under "Managed" tab) or the whole "Unmanaged" tab should remain hidden. 


It's not a big issue (thus low severity) but it certainly is very confusing.