Antlr shows error when interface extends more than one element or extends generic type

Spring Roo Shell generates an interface that extends more than one interface. One of the extended elements is a generic interface. That extends elements are registered on .aj files. When developer execute push-in operation (ROO-3678), all elements generated on .aj files will be pushed in .java file. The interface generated above shows like the following after apply push-in operations:

public interface ProductRepository extends JpaRepository<Product, Long>, ProductRepositoryCustom {
}

Now, Spring Roo Shell prints the following error produced by ANTLR.

line 7:66 mismatched input ',' expecting {'.', 'implements', '{', '['}