Laravel htaccess, redirect specific URL to other folder

I inherited a messy server with a Laravel project. I'm trying to test a new version without breaking the current one.

I was thinking of using .htaccess to redirect /test to a complete new folder with its own Laravel installation.

Current (default) htaccess

IfModule mod_rewrite.c>
<IfModule mod_negotiation.c>
    Options -MultiViews
</IfModule>

RewriteEngine On


# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]

# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f

RewriteRule ^ index.php [L]

# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
</IfModule>

What I've tried

I tried adding the following rules right below the RewriteEngine On

RewriteRule ^test/$ /new [R=302, L]

RewriteRule ^test/? /new [R=302, L]

I get an Internal Server Error with both.