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I don't think that should happen. It should either consistently fail or consistently work.
I assume you can read Java - here's the code that connects to your nexus:
https://github.com/jenkinsci/maven-metadata-plugin/blob/master/src/main/lombok/eu/markov/jenkins/plugin/mvnmeta/MavenMetadataParameterDefinition.java#L196
It is literally those 15 lines that do all the magic of getting all artifact versions from a maven repository and I don't see how they would authenticate in one job run and not in the other. I construct the Basic Auth header in there.