init is not the first action to run on a WordPress install. Here is a basic rundown of a typical stack order.
https://codex.wordpress.org/Plugin_API/Action_Reference
Try hooking into `muplugins_loaded’. I don’t believe it is conditional, so it should run every time.
https://codex.wordpress.org/Plugin_API/Action_Reference/muplugins_loaded
<?php
add_action( 'muplugins_loaded', 'my_script' );
function my_script() {
// my script here
}
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