[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
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 Reporter:  cantuaria     |       Owner:  audrasjb
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  5.9.4
Component:  Permalinks    |     Version:  5.9
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by BaneD):

 Hi I wanted to add that we have noticed through Google Console that all of
 a sudden some links have a bit different URL. For example one of the links
 now has the following appended to it: "/%EF%BF%BC%EF%BF%BC%EF%BF%BCKind"

 This in turn makes the page show 404 error.

 The blog post was created in 2013 and the problem started to happen
 recently. The post is OK for something posted so long ago, however it is
 not something that we have linked to any time recently. It seems to be
 created somewhere within WP in for us unknown place. I am guessing that
 most likely in some archive.

 Website is in en-US language only.

 * In our process we do copy->paste as we write outside of WordPress,
 however it is unformatted paste (CTRL+SHIFT+V) every time. Additionally if
 I copy->paste this:  into our editor it is clearly shown and would be
 obvious that it was copied.

 I would recommend stripping it from permalink functions, however that
 would be just fixing the symptom, would be best to find what is adding it.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55117#comment:21>
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