When clicking to create a KV within folder name, would would be viewing a form that was a form for creating a KV in the root, which when the user clicked to save, saved the KV in the root.
For the moment at least I've removed the code that strips double slashes, and whilst this isn't ideal, it looks like we've picked up one of those bugs that turns into a 'feature', and completely reworking KV to not rely on the double slashes is not really an option right now.
