url-rewriting

Nginx rewrite rule conflict with WordPress permalinks rule

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Facing issue with nginx url rewrite rules. What I want is to serve http://example.com/2015/03/23/post-title/ page when someone tries to access http://example.com/2015/03/23/myfeed/post-title/ url. And it should return 200 status. I tried below rewrite rule which works fine when wordpress permalink is set to default but as soon as I set permalink to custom below rules does not works.

Why does rewrite rule work for page not for custom post type post?

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Update: I read that a custom rewrite rule might be overridden and drop any parameter variables, when the custom rewrite rule is used on a child/parent page/post. The post my custom rewrite rule is meant for, is not a child/parent but it is part of a custom post type. Could this be causing similar rewrite issues (dropped parameter variables)?