[wp-trac] [WordPress Trac] #45184: No metaboxes in v5 b1, but working with 4.9.8 + Gutenberg.

[WordPress Trac]

#45184: No metaboxes in v5 b1, but working with 4.9.8 + Gutenberg.
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 Reporter:  jsmoriss      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  5.0
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Metabox callbacks do not appear to get run in WP v5 b1. In tests, the
 add_meta_box() function is getting run, but the callback is never
 executed. It's working fine in v4.9.8 with Gutenberg v4.1, so this appears
 to be a bug with v5 b1 specifically. There are no PHP errors and no errors
 in the browser console.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45184>
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