Looking at https://jenkins.io/doc/pipeline/steps/workflow-cps/#parallel-execute-in-parallel I see:

      parallel: Execute in parallel
      org.kohsuke.stapler.NoStaplerConstructorException: There’s no @DataBoundConstructor on any constructor of class org.jenkinsci.plugins.workflow.cps.steps.ParallelStep
      

      Notice that the description is missing.

          [JENKINS-39605] Documentation for "parallel" step is broken

          Oleg Nenashev added a comment -

          Not a core issue

          Oleg Nenashev added a comment - Not a core issue

          Marcus Philip added a comment -

          Lowered priority. A documentation bug shouldn't be Critical.

          Marcus Philip added a comment - Lowered priority. A documentation bug shouldn't be Critical.

            Unassigned Unassigned
            cowwoc cowwoc
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