[wp-trac] [WordPress Trac] #48971: Errors after update to 5.3.1

[WordPress Trac]

#48971: Errors after update to 5.3.1
----------------------------+-----------------------------
 Reporter:  caraya          |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Bootstrap/Load  |    Version:  5.3.1
 Severity:  normal          |   Keywords:
  Focuses:                  |
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 I am getting the following errors when previewing a post after upgrade to
 5.3.1


 == public-api.wordpress.com/wp-admin/rest-proxy/?v=2.0:6 WebSocket
 connection to 'wss://public-api.wordpress.com/pinghub/wpcom/me/newest-
 note-data' failed: Error during WebSocket handshake: Unexpected response
 code: 403


 ==/?p=789855&preview_id=789855&preview_nonce=8860e6b287&post_format=standard&_thumbnail_id=-1&preview=true:1
 Failed to set referrer policy: The value 'is not one of 'no-referrer',
 'no-referrer-when-downgrade', \\
 'origin', 'origin-when-cross-origin', 'same-origin', 'strict-origin',
 'strict-origin-when-cross-origin', or 'unsafe-url'. The referrer policy
 has been left unchanged.
 }}}


 Normally I wouldn't have noticed but it keeps reloading my syntax
 highlighter plugin and changing the way that  code looks in the post. The
 same errors happen in Firefox Nightly, Chrome Canary (80) and Crome Stable
 (79)

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Ticket URL: <https://core.trac.wordpress.org/ticket/48971>
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