[wp-trac] [WordPress Trac] #37697: Strange behavior with thumbnails on preview in 4.6

[WordPress Trac]

#37697: Strange behavior with thumbnails on preview in 4.6
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 Reporter:  jbenton          |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Post Thumbnails  |    Version:  4.6
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 Since upgrading my site to 4.6, we've had strange behavior regarding
 featured images on preview. Whenever a preview_nonce appears in a preview
 URL, an additional &_thumbnail_id=xxxxxxx appears. And at that point, all
 featured-image thumbnails on the page become that specific image — even
 when they appear in a different loop or are called through other means.
 @swissspidy says on Twitter this may be related to this change in 4.6:

 https://core.trac.wordpress.org/changeset/38118

 Adding a wp_reset_postdata() does not seem to fix the problem. Screenshots
 and code available in this tweets in this Twitter thread:

 https://twitter.com/swissspidy/status/766004453807882244

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Ticket URL: <https://core.trac.wordpress.org/ticket/37697>
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