slachiewicz commented on issue #852:
URL: 
https://github.com/apache/maven-plugin-tools/issues/852#issuecomment-5741105273

   The iteration that fails is over `project.getArtifacts()`, and 
`MavenProject.getArtifacts()` publishes its set before it is fully built, so a 
concurrent caller sees a half-filled `LinkedHashSet`; filed as 
apache/maven#13200 with the fix on the core side. What is not clear is which 
second thread touches the same project during `plugin:descriptor` — could you 
add the Maven version, the exact command line (`-T`?) and any build extensions 
from the failing run?


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