Jenkins promoted builds seeked and missing

We never used a Promoted Builds plugin and recently (likely after an update to 2.164 and matching recent plugins that we do use) a job that has a step to "Trigger/call builds on other projects" began failing at that as traced below. My guess is that somebody somewhere added a dependency on functionality of promoted builds, but did not manifest that the plugin should now be installed?

Tue Feb 12 11:29:07 UTC 2019 : Preparation for REST API Python tests is completed, now proceeding to individual tests
Returning node parameter for master-worker
FATAL: hudson/plugins/promoted_builds/Promotion
java.lang.NoClassDefFoundError: hudson/plugins/promoted_builds/Promotion
	at hudson.plugins.git.GitRevisionBuildParameters.getAction(GitRevisionBuildParameters.java:60)
	at hudson.plugins.parameterizedtrigger.BuildTriggerConfig.getBaseActions(BuildTriggerConfig.java:356)
	at hudson.plugins.parameterizedtrigger.BuildTriggerConfig.perform3(BuildTriggerConfig.java:459)
	at hudson.plugins.parameterizedtrigger.BlockableBuildTriggerConfig.perform3(BlockableBuildTriggerConfig.java:67)
	at hudson.plugins.parameterizedtrigger.TriggerBuilder.perform(TriggerBuilder.java:93)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
	at hudson.model.Build$BuildExecution.build(Build.java:206)
	at hudson.model.Build$BuildExecution.doRun(Build.java:163)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
	at hudson.model.Run.execute(Run.java:1816)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:429)
Archiving artifacts
Recording test results
[BFA] Scanning build for known causes...
[BFA] No failure causes found
[BFA] Done. 0s
Collecting metadata...
Metadata collection done.
Finished: FAILURE