WordPress apache rewrite captures all your requests when they enter the root directory of the website.
You can add the following to the beginning of your rewrite rules:
RewriteEngine On RewriteBase / # add this line to ignore all re-writes within the TEST folder. RewriteRule ^test - [L,NC]
This ignores all requests containing the test / directory. Then I would suggest adding a separate .htaccess file to your Zen base folder to handle any smart SEO mods, etc., rather than cluttering your main .htaccess file if possible.
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