Yesterday one of my jobs started to show the same behavior, but we are not using the matrix-project-plugin. At some point (maybe after we deleted the original workspace-folder of a certain job) jenkins started to build the project in a folder suffixed by "@2" - but only on one specific node. Recreating the Pipelinejob with the same name didn't help. Today i did a restart of the server and that seems to have soled the issue for now.
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