[wp-trac] [WordPress Trac] #45744: post preview does not work

[WordPress Trac]

#45744: post preview does not work
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 Reporter:  kyborn        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  critical      |   Keywords:
  Focuses:                |
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 As I mentioned in my issue with revisions, there seems to be a real
 problem with the Preview feature in v 5.02

 I created a NEW post using the Blocks editor. When I ask to Preview I get
 a page which does a continuous re-draw of the WordPress logo and the
 message Generating preview… The URL says only "about:blank"

 And again when I go to save I get the error Updating failed

 If I attempt to go to another part of admin I get the message "Changes you
 made may not be saved.


 The theme I am using is Twenty Seventeen Version: 1.9

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Ticket URL: <https://core.trac.wordpress.org/ticket/45744>
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