BeanPostProcessor bean declaration that retrieves object from injected ObjectFactory with bounded type parameter results in missing PluginRegistry bean during application startup

Given:

• a Spring-Boot project
• using Spring-HATEOAS

When:

• there is a BeanPostProcessor bean declaration
• which gets an ObjectFactory with bounded type parameter injected
• where getObject() is called on the injected ObjectFactory

Then:

• application startup fails with error Parameter 0 of method _relProvider in org.springframework.hateoas.config.HateoasConfiguration required a bean of type 'org.springframework.plugin.core.PluginRegistry' that could not be found..

The following example bean declaration will cause the error:

@Bean
public BeanPostProcessor exampleBeanPostProcessor(ObjectFactory<? extends ExampleComponent> exampleComponentObjectFactory) {
    exampleComponentObjectFactory.getObject();
    return new BeanPostProcessor() {};
}

Any of the following alterations to the bean declaration will avoid the error:

• using a non-bounded type parameter
• not calling getObject() on the ObjectFactory
• declaring a bean of a type not BeanPostProcessor

Complete error message:

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method _relProvider in org.springframework.hateoas.config.HateoasConfiguration required a bean of type 'org.springframework.plugin.core.PluginRegistry' that could not be found.

The following candidates were found but could not be injected:
	- User-defined bean method 'relProviderPluginRegistry' in 'HateoasConfiguration'


Action:

Consider revisiting the entries above or defining a bean of type 'org.springframework.plugin.core.PluginRegistry' in your configuration.

Minimal example project: https://github.com/VTLob/spring-hateoas-issue

Start by reproducing the startup failure in the linked minimal example project with the bounded ObjectFactory BeanPostProcessor declaration. Compare the listed declaration variations and trace why calling getObject() prevents the PluginRegistry bean from being injected. Done means the example starts successfully with the original scenario and the PluginRegistry is available.