[wp-trac] [WordPress Trac] #59915: Preview Whilst Editing Broken

[WordPress Trac]

#59915: Preview Whilst Editing Broken
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 Reporter:  simonjonharding    |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:
Component:  Editor             |     Version:  6.4.2
 Severity:  minor              |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
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Changes (by mcsr):

 * version:  6.4 => 6.4.2


Comment:

 I'm experiencing the same issue. My WordPress site is running on WordPress
 6.4.2.

 When manually opening the preview link in a new tab, the preview works
 fine. But when just clicking on the preview button in the Gutenberg
 editor, the browser is getting redirected to `/wp-admin/undefined`. I'm
 experiencing this on the default post types (pages, posts) as well as
 custom post types.

 With previous versions of WP this worked fine. We didn't change anything
 to the theme or plugins, so I can't imagine what's causing this issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59915#comment:4>
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