I did write a test in the commit:
https://github.com/hibernate/hibernate-orm/pull/6018/commits/69ea77de8c431b52d1199948020a40de566290cb#diff-7619795eb4c637683659aa3ce1984189cc71963985a19f42b3c3d9ef2b3b01b7

I agree that with your solution this should not happen, but for consistency with BeanImpl there should also be a null check in NamedBeanImpl. Or we can remove both null checks if it can never happen anymore, but I prefer there is one.