Custom Filter using meta_value in wordpress admin list not working

The initial thing that jumps out is that you’re using:

template=default

in the URL, but in the code you are using

if( isset($_GET['_wp_page_template']) && !empty($_GET['_wp_page_template']) ) {

you should be checking:

if( isset($_GET['template']) && !empty($_GET['template']) ) {

Also, don’t forget to sanitize the $_GET as that’s user input and cannot be trusted.

Hope that helps.

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