Feed publishing scheduled posts that are not yet live

I often create pages in advance and schedule them to be published in the future, but I've noticed that they tend to show up on my feed upon creation, rather than at their established publish dates. Even when they're not available in the website itself, they can be seen within the feed.

I can only assume it's taking the date created/edited into account, instead of the date published.

Start by tracing how the feed selects and dates pages, comparing scheduled pages with the website's visibility rules. Reproduce the issue with a page scheduled for a future publish date; done means it is absent from the feed until that date and appears afterward.

Written by the indexing model from the issue text.