The only way to get the result you note is to call that_sub() before this_sub(). This prints "Hello Jeff" just fine
$this_variable = "Jeff";
print "Hello "."$this_variable";
All I can presume is that your test case above is not the same as your real code as the test works exactly as expected. this_sub sets the global var $this_variable which is then available everwhere.
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