I haven’t yet tried to finally fix my issue but dare to say what’s wrong: WP doesn’t allow me to use $_GET directly. It expects these variables to get sanitized by first whitelisting them through the query_vars hook and later calling them through a WP_query instance – haven’t figured out in detail yet but that seems to make sense to me. Here’s a post on the wordpress forum that might explain more: query-string-url-parameter-in-wp-admin-custom-page
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