getElementById not changing

In a fresh browser console the following variable is expected to have undefined value:

var old = document.getElementById("loadScript");

Output is as expected: undefined

Now we add the following code:

var head = document.getElementsByTagName("head")[0];
var script = document.createElement('script'); = 'loadScript';
script.type = 'text/javascript';
script.src = 'http://server.ip/script.js';

Now we add the same code again:

var old = document.getElementById("loadScript");

Why the output is still null? Isn’t it supposed to get value since we changed to loadScript?

On the /script.js I have just a simple code, nothing fancy: alert('Executed')

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