Jacoco missing coverage when test is created - maven

Question

I have a project with spring-boot 2, JUnit 4, jacoco 0.8.6 and I use maven to run unit test, I have the following class:
#Component
public class AccountVOValidator implements FormValidator<AccountVO> {
#Override
public void validate(AccountVO object, Object... params) throws GenericException {
//logic
}
}
This implements FormValidator interface, it looks like this:
public interface FormValidator<T> {
public void validate(T object, Object... params) throws GenericException;
}
I already created the test class for that, it looks like this:
#RunWith(MockitoJUnitRunner.class)
public class AccountVOValidatorTest {
private TestUtils testUtils = new TestUtils();
#InjectMocks
private AccountVOValidator accountVOValidator;
#Test
public void shouldValidateOk() throws GenericException {
accountVOValidator.validate(accountVO, transaction);
}
}
I have several unit test for different packages and jacoco report looks like this:
enter image description here
When I run "mvn clean test", AccountVOValidatorTest ran without problems and all tests passed successfully.
All classes that implements FormValidator interface have a missing coverage in jacoco report, I implements interfaces in my services classes and they got coverage in report, do you have an idea what it happens?
I am not sure why all classes that implements FormValidator interface don't get coverage in jacoco report.