'Preview Changes' in CPT with non-standard Post Formats throws 404 error

[Faisal79c2]

I've tested a few custom post type plugins (having post formats support).

ISSUE: While editing any CPT entry (having some post format assigned other than 'standard') if I want to view those changes and click on 'Preview Changes' button, it throws a 404 error.

The URL which throws 404 error is something like this ...

http://www.example.com/cpt-name/post-name/?preview_id=559&preview_nonce=0a0feaeab7&post_format=gallery

Now, if I remove

post_format=gallery

parameter from this URL, it works just fine and displays the post.

[DrewAPicture]

Duplicate of #31394.