Description:
------------
Within methods the $this variable seems to leak into the scope of statically called methods. Even when the called static function is in an entirely different class.
It only happens when the statically called method is not explicitly defined as static.

Reproduce code:
---------------
<?php

class instance{
    
    var $test = 'test';
    
    function do_thing(){
        static_class::func();
    }
}

// happens with and without the abstract keyword
abstract class static_class{
    
    function func(){
        echo 'output: '.$this->test.'<br/>';
        echo 'class: '.get_class( $this ).'<br/>';
        echo 'How did I get here?<br/>';
    }
    
}

$instance = new instance();
$instance->do_thing();
?> 

Expected result:
----------------
A warning telling me I shouldn't use $this in a static scope.
Or just a notice saying $this is not defined / not an object.

Actual result:
--------------
output: test<br/>
class: instance<br/>
How did I get here?<br/>