Description:
------------
In PHP 8.0.0 - 8.0.10, a die statement within the header_register_callback function will not prevent the trigger from being outputted. In previous versions this was the case. 

This is with the standard settings.

I am not sure if this is caused by the performance upgrades and if this is intended or not. However, I cannot find any documentation either.

Test script:
---------------
<?php
ob_start(); // make sure ob_level is set to 1

function callback()
{
    echo "In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: ";
    die();
}
header_register_callback("callback");

ob_end_clean();
echo "Trigger.";
echo "Execution died before this echo statement.";

Expected result:
----------------
In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: 

Actual result:
--------------
In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: Trigger.