[wp-trac] [WordPress Trac] #52295: The response is not a valid JSON response - URL permalink using the ? sign

[WordPress Trac]

#52295: The response is not a valid JSON response - URL permalink using the ? sign
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 Reporter:  rshlo         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.6
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Encountered a problem at a friend's blog so tried to recreate it on a test
 site.

 1. Installed vanilla WP_5.6-he_IL with no additional settings or changes
 on shared Dreamhost hosting with default settings - no cache, Cloudflare
 or any other settings. Server uses php 7.4
 2. Created a first post - everything works great.
 3. Changed the permalink to the simple permalink format e.g. /?=123, that
 was the default in older versions.
 4. Tried to create a new post with a URL inside the post and got the above
 mentioned error message.
 5. Changed to other permalink structures - no problem at all.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52295>
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