[wp-trac] [WordPress Trac] #55117: Possible 5.9 Bug: Unknown character ( or %ef%bf%bc ) on content title

[WordPress Trac]

#55117: Possible 5.9 Bug: Unknown character ( or %ef%bf%bc ) on content title
--------------------------+-----------------------------
 Reporter:  cantuaria     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  5.9
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 Since WordPress 5.9, one of my clients revistabula.com started having an
 akward bug. Sometimes, the character  (%ef%bf%bc) is being automatically
 inserted in the post title after a publish or update using the visual
 editor.

 He uses an environment different from mine, so I couldn't reproduce the
 issue myself, he uses Chrome and Mac. As such, I don't know if this is a
 bug from 5.9 itself or from a plugin. In any case, I've fixed the issue
 with a simple string replace at `wp_insert_post_data` action.

 But yesterday, one of the blogs I follow, published an article containing
 the same bug:  https://macmagazine.com.br/post/2022/02/07/promocoes-na-
 app-store-swim-out-911-operator-navidys-dislexia-spelling-
 help-e-mais%ef%bf%bc/ . It's a Mac centered blog, so I suppose they also
 use Mac for editing (Ps.: not sure if they will fix it)

 I've then searched on Google for this issue, and it have a few complains
 from a couple of years ago, related with Yoast SEO plugin. But none
 recent. I've then searched for that symbol in *.wordpress.* domains
 [https://www.google.com/search?q=%25ef%25bf%25bc%2F+site%3A*.wordpress.*&biw=1325&bih=1311&tbs=cdr%3A1%2Ccd_min%3A1%2F1%2F2021%2Ccd_max%3A1%2F1%2F2021&ei
 =u70CYoqZBMy45OUP6t-
 6cA&ved=0ahUKEwjK4r6c5fD1AhVMHLkGHeqvDg4Q4dUDCA4&uact=5&oq=%25ef%25bf%25bc%2F+site%3A*.wordpress.*&gs_lcp=Cgdnd3Mtd2l6EANKBAhBGAFKBAhGGABQAFgAYLoEaAFwAHgAgAEAiAEAkgEAmAEAwAEB&sclient
 =gws-wiz in Google at whole 2021] and
 [https://www.google.com/search?q=%25ef%25bf%25bc/+site:*.wordpress.*&tbs=qdr:w&source=lnt&sa=X&ved
 =2ahUKEwi6g-We5fD1AhXeFbkGHVFQBzYQpwV6BAgCEBw&biw=1325&bih=1311&dpr=1 for
 the last weeks]... no results in 2021, 3 pages of results for last week.

 Anyone else having this issue or can better test on a Mac trying to
 reproduce the issue? Also, not sure if this should be filled at Gutenberg,
 as I'm not sure if the issue happens in old editor as well.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55117>
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