ZF-11585: Zend_Controller_Action_Helper_ViewRenderer::getViewScript() removes upper case letters in case the action has it
See ZF-10725 - the fix which was added there for cleaning the action from non-alphanumeric characters is case sensitive, and therefore removes upper-case letters.
e.g., trying to access http://mysite/Controller/Action will break with
script 'controller/ction.phtml' not found in path
notice the missing A in the script's filename