[wp-trac] [WordPress Trac] #40240: Posts does not show when slug="ad"

[WordPress Trac]

#40240: Posts does not show when slug="ad"
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 Reporter:  sachirachin   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.7.3
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Recently I tried to add new post with already exiting categories, but each
 time I try adding the post, after I publish/ save it, it completely goes
 off the post list and I can't preview it on edit mode as well. After few
 duplicate posts, I noticed it it happens only when I add categories.

 Then i tried to remove categories one by one and ended by noticing it
 happens when I add sub category with slug called "ad". Each time I try to
 add this category to a post, everything goes haywire. Then I renamed same
 category to "aad" and it started to work without any issue. I also tried
 other 2 letter slugs and it works without any issue.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40240>
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