DependencyManagement analysis throws "Unknown packaging" error

When running mvn site under a project that inherits the spring starter bom (see below), there are a number of unusual packagings (relating to klib for kotlin, bundle for osgi), the goal does eventually complete but the logs are filled top to bottom with stacktraces making it very difficult  to find genuine errors.

Create a maven project with this parent:

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.2.0.RELEASE</version>
</parent>

Run mvn site.

If this isn't a bug with maven site, then please advise what can be done (either in my project, or in the upstream projects) to fix this?