How to fix domain redirect with slash using Apache2 and Bitnami?

I'm running a Wordpress website with Bitnami which confused me a lot of ways.

The issue is when you click a link www.domain.com/ja/ then it goes to www.domain.comja because there is a missing slash /

EDIT: I discovered how it handles www.domain.com/ja without "/" in the last works fine as I expected, otherwise www.domain.com/ja/ with "/" slash it ended up with www.domain.comja

I've tried a lot of ways to solve this issue and still no solution.

Here is my apache2 conf from /opt/bitnami/apps/wordpress/conf/httpd-app.conf

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1/ [R=permanent,L]
RewriteRule ^index\.php$ - [S=1]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]

I am only can think 3 possible reasons:

1. Your browser cached 301 redirect from an old rewrite rule or something similar. Try to access the URL from other browser to confirm it.

2. The redirector is from the Wordpress/or the plugin. Try to disable all plugin first or change index.php to empty file.

3. You still have the wrong rule like:

   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteCond %{REQUEST_URI} /(.+)/$
   RewriteRule ^ https://www.example.com%1 [L,R=301]
   

above will redirect like your case, so change to:

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [L,R=301]