Spring Lookup method injection does not perform collection lookup

When using lookup method injection, collections do not work as they do for other injection points (e.g. constructor, setter). For example, the following fails in Spring Boot with the error A component required a bean of type util.function.Supplier' that could not be found.:

@Component
public class ExtensionCaller implements ApplicationRunner {

    @Lookup
    public List<Supplier<String>> suppliers() {
        return List.of();
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        suppliers();
    }
}

I would've expected that calling the method would work, returning all beans of type Supplier<String>.

Comment From: snicoll

I would've expected that calling the method would work, returning all beans of type Supplier.

Unfortunately, that's not the case. @Lookup is really about a getBean whereas Collection<X> is syntactic sugar for the injection point (or getBeans).