Redirection conflicts between WordPress and other root folders

My question is quite tricky.
I have a WordPress install running on root folder with the Website URL setting: www.domain.com and languages like http://www.domain.com/fr/
I also have other hard coded folders in root directory such as /order/ or /auth/ that I would like users to access on https without www so https://domain.com with langages like https://domain.com/fr/auth/ (where /auth/ is the hard coded folder).
However it’s redirecting me to https://www.domain.com/fr/auth/.
If I choose non-www URL for everything I get a WordPress 404 page while trying to access my hard coded folder.

Long story short, is there a way to avoid wordpress redirection if we use https so we can access other root hard coded folders or using some htaccess rules?

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My htaccess at the moment is:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

RewriteRule ^([^/]*)/auth/$ /auth/?lang=$1 [L]

Been trying to come up with a solution for the architecture since a week. Thanks for your help!

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