From TestWiki

Maybe this page should be moved to Sandbox. Ideally the main namespace is for testing stuff and the project namespace is non-tests, so it wouldn't make sense to have a sandbox in project-space (although this makes sense for other wikis) Naleksuh (talk) 05:40, 14 July 2020 (UTC)[reply]

I wondered about this as well. It is kind of odd, though, I get the thinking since, on other projects, there's usually a project namespace sandbox. In this case. I think a cross-namespace from project namespace makes sense, as people seem to look up the sandbox page in that namespace. Otherwise,  Done boldly. Dmehus (talk) 06:56, 14 July 2020 (UTC)[reply]