Expected Behaviour:
If you have a "draft" game, that you've never published, someone who is not you should not have access to it, or should be even aware it exists, even if they know the URL. Right now, if you go to a URL for which you do not have access, e.g. https://escapecharacter.itch.io/made-up-game , it shows a 404 page and no indication whether there is a game in draft or not.
Current Behaviour:
If you go to a URL for a game which is in draft, it shows a 404 page, but the title of the page is taken from the draft. This lets people guess what games people are working on an view their titles before they were intended to be released.
e.g. go to https://escapecharacter.itch.io/blunt-quaternion, for which I have a draft game, you can see the "title" of the page has the game name. As opposed to the "Expected behaviour" above, where the title is just itch.io
FYI - This game may be published by the time you read this post, but you can verify this behaviour yourself.