Create a snippet (Mercurial)
Clone via HTTPS
Notice a 404 not found error
Issue #12930 was marked as a duplicate of this issue.
Right now there's a bug relating to snippet lookup where we don't chop off the last part of the URL. If you just clone using the encoded ID, it should work fine.
As an example for this: https://bitbucket.org/snippets/belak/KqqyM
The clone url is listed as https://email@example.com/snippets/belak/KqqyM/hello-world but this doesn't work. If you remove the /hello-world at the end, you should be able to clone it.