Vanity URL working inconsistently

Hi All,

I am facing weird issue of Vanity url which works for some urls and does not for some of them.

The Urls are unique in the AEM application.

for Example:

https://www.site-A/en/vanity-url-one.html =>sling:vanityPath configured abc.html works when accessed https://www.site-A/abc.html

but another page:

https://www.site-A/en/vanity-url-two.html =>sling:vanityPath configured xyz.html does not works when accessed https://www.site-A/xyz.html

We can see in the error log stating the resource doesn't exists.

Also sling resource resolver resolves the  page https://www.site-A/abc.html  but doesn't resolves the page https://www.site-A/xyz.html

I have installed the vanity url component on the publish instance and have configured the dispatcher according to adobe documentations

Also used this link for the setup.

Has anyone faced this issue?

the problem looks to be how vanity url work along with dispatcher. The vanity url http://localhost:4503/xyz works fine directly on publisher

But the same page over dispatcher url https://www.site-A/xyz  doesnt works, but having https://www.site-A/test-vanity-url-another works fine. 

Attaching the error log response, the dispatcher vanity url(https://www.site-A/libs/granite/dispatcher/content/vanityUrls) service response and the configured vanity url

04.08.2020 11:27:19.137 *INFO* [127.0.0.1 [1596533239134] GET /xyz.html HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Resource /content/site-A/xyz.html not found

vhost configuration:

<VirtualHost *:80>
ServerName www.site-A
Header set Host "www.site-A"
    <Directory /Users/subrato.kha/dispatcher-cache/site-A>
        <IfModule disp_apache2.c>
            SetHandler dispatcher-handler
            ModMimeUsePathInfo On
        </IfModule>
         
        Options FollowSymLinks
        AllowOverride None
         
        # Apache httpd 2.2
        # Order allow,deny
        # Allow from all
         
        # Apache httpd 2.4
        Require all granted
    </Directory>
    DocumentRoot "/Users/subrato.kha/dispatcher-cache/site-A"
    ErrorLog "/private/var/log/apache2/www.site-A-error_log"
    CustomLog "/private/var/log/apache2/www.site-A-access_log" common

    # Rewrite rules for removing html from extension
  # Handle requests to pages ending with a trailing slash
  RewriteEngine on

  RewriteCond     %{REQUEST_URI} !^/content/dam
  RewriteCond     %{REQUEST_URI} .*/$
  RewriteCond     %{REQUEST_URI} !^/$
  RewriteRule     (.*)/$ $1.html [PT,L,QSA]
  # Handle requests to pages ending without a trailing slash
  RewriteCond     %{REQUEST_URI} !^/content/dam/.*
  RewriteCond     %{REQUEST_URI} !.*\..*$
  RewriteCond     %{REQUEST_URI} !.*/$
  RewriteRule     (.*)$ $1.html [PT,L,QSA]

  #redirect /file.html to /file
  RewriteCond %{THE_REQUEST} /([^.]+)\.html [NC]
  RewriteRule ^ /%1 [NE,L,R=301]
</VirtualHost>