Message Title

I'm able to reproduce this in 4.3.6 with out using ManyToOne or any other relationship tags. This code doesn't complain if I change the nestedEmbeddable field to be @Transient, so it seems to be what's causing the problem. Also, if I make the other basic fields in EmbeddedWithNestedEmbedded @Transient, I notice that the value in the associated ArrayIndexOutOfBoundsException is decremented once for each field I make @Transient, ending at zero if there are no other fields except nestedEmbeddable.

public class Main {

    public static void main(String[] args) {
        Persistence.createEntityManagerFactory("test");
    }
    
    @Entity
    public class TestEntity {
        @Id int id;
        @Embedded EmbeddedWithElementCollection embedded;
    }
    
    @Embeddable
    public class EmbeddedWithElementCollection {
        @ElementCollection
        List<EmbeddedWithNestedEmbedded> embeddedsWithEmbedded;
    }
    
    @Embeddable
    public class EmbeddedWithNestedEmbedded {
        String field1;
        int field2;
        @Embedded
        SimpleEmbedded nestedEmbedded;
    }
    
    @Embeddable
    public class SimpleEmbedded {
        String fieldA;
        int fieldB;
    }
    
}

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">
	<persistence-unit name="test">
		<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
		<properties>
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
		</properties>
	</persistence-unit>
</persistence>