WordPress .htaccess RewriteRule

does someone know why the imprint rewrite rule does not work?
It does not show the imprint-custom page.

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^imprint/(.*)$ imprint-custom/$1 [L]
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

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