Is GitHub currently leaking private issues and pull requests?

Anyone else experiencing this?

In a Pull Request's description, I typed `#<private issue id>` (eg. `#1234`) and the suggestions (coming from https://github.com/suggestions/issue/...) popping up are for completely random repos I have no affiliation with.

I searched google for some of the titles returned and got no results (using `site:github.com`)