Error initializing repository with query generated by method name that returns projection

[plc010]

Issue seems to have started with Spring Boot 2.6.3.

When a JpaRepository interface defines a query created by a method name that returns a projection the application will fail to start with the error below.

Failed to create query for method public abstract com.bug.demo.bugdemo.AgeProjection com.bug.demo.bugdemo.PersonRepository.findByFirstNameIgnoreCase(java.lang.String)! null; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract com.bug.demo.bugdemo.AgeProjection com.bug.demo.bugdemo.PersonRepository.findByFirstNameIgnoreCase(java.lang.String)! null

Repository:
`public interface PersonRepository extends JpaRepository<PersonEntity, Integer> {

Optional<AgeProjection> findByFirstName(String firstName);

}`

Adding a @query annotation to the method with the JPQL query below will successfully execute and return the projection.

`public interface PersonRepository extends JpaRepository<PersonEntity, Integer> {

@query("select p from PersonEntity p where p.firstName = ?1")
Optional findByFirstName(String firstName);

}`

Entity class:
`@Entity
public class PersonEntity {
@id
private Integer id;

private String firstName;

private String lastName;

private Integer age;

// getters/setters
}`

Age Projection:
public interface AgeProjection { Integer getAge(); }

[plc010]

Just saw this issue has already been reported: #2408 (comment)