Spring Data JPA -- Multi-level inheritance

I have the following Entity relationship:

Shape
|
Triangle
|
Parallelogram
|
Rectangle
|
Square

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class Shape

@Entity
@Table(name = "TRIANGLE")
public class Triangle extends Shape

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class Parallelogram extends Shape

@Entity
@Table(name = "RECTANGLE")
public class Rectangle extends Parallelogram

@Entity
@Table(name = "SQUARE")
public class Square extends Parallelogram

I created two Repositories:

- public interface ShapeRepository extends JpaRepository<Shape, Integer>

- public interface ParallelogramRepository extends JpaRepository<Parallelogram, Integer>

If I call findAll() on ParallelogramRepository, I get back instances of both Rectangle and Square.

If I call findAll() on ShapeRepository, I only get back instances of Triangle.

Is there a reason why I don't get back instances of all three subtypes when when I call findAll() on ShapeRepository? Does it only look at the immediate children for non-abstract entities?

Thanks,
Bert