NPE in MavenProject (3.9.10) in parallel build

Curious if people have seen this NPE before:
https://github.com/helidon-io/helidon/actions/runs/15985949089/job/45090504083?pr=10313#step:3:9789

We're running with -T8 (
https://github.com/helidon-io/helidon/actions/runs/15985949089/job/45090504083?pr=10313#step:3:166).
(Github Actions.)

Relevant snippet:

Caused by: java.lang.NullPointerException: Cannot invoke
"java.util.Set.add(Object)" because "this.artifacts" is null
at org.apache.maven.project.MavenProject.getArtifacts
(MavenProject.java:683)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.getPathElements
(AbstractJavadocMojo.java:2491)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addJavadocOptions
(AbstractJavadocMojo.java:4550)
at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport
(AbstractJavadocMojo.java:1968)

The fact that it was javadocs I think may be immaterial. It is certainly
the case that MavenProject is not thread safe. Maybe that's by design?
Should I file a bug?

Best,
Laird