Description:
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Trying to use ReflectionClass::getStaticPropertyValue() on protected static properties of class results in exception with information about non existing property. However ReflectionClass::getStaticProperties() returns that property with correct value on all supported PHP versions.
Adding ReflectionProperty::setAccessible(true) doesn't affect final effect.

Of course I can use getStaticProperties() array, but maybe getStaticPropertyValue() should be fixed or at least some documentation note be added?

After research I found it's related to #54620, but maybe setAccessible() should also affect getStaticPropertyValue() call?

Test script:
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<?php

class foo {
    protected static $test = 'bar';
}

$classReflection = new ReflectionClass('foo');
$property = $classReflection->getProperty('test');
var_dump($property);

$property->setAccessible(true); //Changes nothing in that case
var_dump($classReflection->getStaticProperties());
var_dump($classReflection->getStaticPropertyValue('test'));

Actual result:
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http://3v4l.org/om1lZ