I see no evidence that jenkinsci/jenkins#5687 has introduced a leak, so I do not think it should be reverted. I _do_ see evidence that registering AntClassLoader (specifically) as parallel-capable has increased the heap size requirement for pipeline-steps-doc-generator: 1280 MiB seems to be sufficient, while what JVM ergonomics picked for e.g. https://ci.jenkins.io/job/Infra/job/pipeline-steps-doc-generator/job/PR-92/1/consoleFull (945 MiB) is insufficient. My recommendation to operators is to adjust the hardware and/or -Xmx settings to ensure that a sufficiently large heap is provided.
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