Post preview gives 404 when permalinks are purely date based

I will sum up my findings for future use by others:

  1. When using permalink structure that uses only date tags, WordPress is unable to identify a unique post because there may be more posts in any given day.
  2. For this reason WordPress treats URLs with date based tags only as date archive pages.
  3. Given the permalink structure, WordPress still allows for previewing of posts with present or past publication date (published or drafts) and posts that have publication date set for the future and are still drafts. Previewing posts that are scheduled for future publication and are not drafts, is impossible – they will return the 404 error.

@Milo, @t3los, thanks for your input.