wordpress sub-category ( lowercase letters + non-latin characters ) = 404

If the sub-category’s slug is a combination of lowercase letters and Korean, page 404 appears.

1 : NGINX settings

location / {     try_files $  uri $  uri/ /index.php?$  args; } 

2 : WordPress – Permerlink settings

  • Custom: /%category%/%postname%/
  • Category Base:.

3 : WordPress – Yoast

  • Taxonomies > Category URLs ( Remove )

4 : Tested content

4-1 : In case of parent category ✅

  • mywebsite.com/한글 = 200
  • mywebsite.com/a한글 = 200
  • mywebsite.com/한글B = 200

4-2 : In case of post ✅

  • mywebsite.com/한글/post글 = 200 ( lowercase + non-latin )

4-3 : In case of child category ⚠️

  • mywebsite.com/한글/한글 = 200
  • mywebsite.com/한글/a한글 = 404 ❌
  • mywebsite.com/한글/한글b = 404 ❌
  • mywebsite.com/한글/C한글 = 200
  • mywebsite.com/한글/한글D = 200
  • mywebsite.com%2F%ED%95%9C%EA%B8%80%2Fa%ED%95%9C%EA%B8%80 = 200 ⭕️ ( /한글/a한글 : url encoded )
  • mywebsite.com/한글/A한글 = 200 ⭕️ ( /한글/a한글 : uppercase )

5 : Reference question

Arabic Characters in URL returns 404 Error

I think it might be related to @user139986 ‘s answer.

I don’t know how to handle this problem .. 😭