Saw this when updating the google-http-java-client from 3.1.2 to 3.2.0 of the plugin. I'm not immediately sure whether this is a regression:
[INFO] — maven-dependency-plugin:3.2.0:analyze (default-cli) @ google-http-client —
Warning: Non-test scoped test only dependencies found:
Changing Guava to scope test breaks the build, which is expected based on the code. The warning seems incorrect.