Description:
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Test scripts in https://gist.github.com/nikic/39960cf61b18803fa522e6287cdb17cc. Run with -d opcache.preload=p1.php p3.php.

To make the failure more obvious, add

$r = new ReflectionClass('C');
var_dump((string) $r->getParentClass());

to p3.php, as this will trigger an assertion failure.

The problem is that class B is removed from the preload state, because it has unresolved constants. However, class C is already linked to it. Then, at runtime, we may replace B with a different class.