@Replace fails when run inside Eclipse

This issue is causing problems as I cannot step into code as it never gets run. But when run from the command line, it all works fine. I've tried running `./gradlew eclipse` and the re-importing the project, but that does not work.

### Steps to Reproduce

* Created a default application and configured for security and JWT
* Enabled `login` endpoint
* Created the following class:
```
@Replaces(DefaultLdapGroupProcessor.class)
@Singleton
public class LdapGroupMapper extends DefaultLdapGroupProcessor {

private static final Map LDAP_TO_ROLE = Map.of("QA", "QA");

@Override
public Optional processGroup(final String group) {
log.debug("Attempting to map ldap role: {}", group);
final var opt = Optional.ofNullable(LDAP_TO_ROLE.get(group));
if (opt.isEmpty()) {
log.debug("No mapping for ldap group: {}", group);
} else {
log.debug("Mapped ldap group {} onto role: {}", group, opt.get());
}
return opt;
}

}
```

### Expected Behaviour

When run i would expect a response to contain only a single role `QA`

### Actual Behaviour

Instead I get all the roles from our LDAP server.

### Environment Information

- Ubuntu 19.04 (5.0.0-20-generic)
- Micronaut 1.2.0.RC2
- OpenJDK Runtime Environment (build 11.0.3+7-Ubuntu-1ubuntu219.04.1)

### Test Project

Can be located here: https://github.com/KangoV/mn-test-replaces

Start with the @Replaces(DefaultLdapGroupProcessor.class) example and the linked mn-test-replaces project, comparing behavior after ./gradlew eclipse and re-importing in Eclipse with the command-line run. Trace why the replacement is not active in Eclipse and verify the login response contains only the QA role.

Written by the indexing model from the issue text.