[wp-trac] [WordPress Trac] #62948: Posts tagged with complex Emoji can't be found

[WordPress Trac]

#62948: Posts tagged with complex Emoji can't be found
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 Reporter:  edent              |      Owner:  (none)
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Posts, Post Types  |    Version:  6.7.2
 Severity:  normal             |   Keywords:
  Focuses:                     |
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 If a post is tagged with `🏳️‍⚧️` - it cannot be found at
 `tag/%F0%9F%8F%B3%EF%B8%8F%E2%80%8D%E2%9A%A7%EF%B8%8F`

 * I have several blog posts which have a tag of "🏳️‍⚧️"
 * The tag shows on the posts - for example
 https://shkspr.mobi/blog/2023/04/some-thoughts-on-hacking-the-cis-tem/
 * If I visit the tag page, I'm told that no posts exist with that tag -
 for example https://shkspr.mobi/blog/tag/🏳️‍⚧️/

 Some simpler emoji *do* work as tags.  For example
 https://shkspr.mobi/blog/tag/😊/

 Moderately complex flag emoji also work. For example
 https://shkspr.mobi/blog/tag/🏴‍☠️/ and
 https://shkspr.mobi/blog/tag/%f0%9f%8f%b3%ef%b8%8f%f0%9f%8c%88/

 My backend database has an encoding of utf8mb4_unicode_520_ci
 (10.6.20-MariaDB).

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Ticket URL: <https://core.trac.wordpress.org/ticket/62948>
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