cleanup policy task may fail due to DetachingList cannot be cast to java.util.Set

2020-02-03 11:36:45,512+0000 WARN  [quartz-3-thread-10] *SYSTEM org.sonatype.nexus.quartz.internal.task.QuartzTaskJob - Task cf66b3ac-725c-49b2-866e-38e6c7368d6e : 'Cleanup service' [repository.cleanup] execution failure
java.lang.ClassCastException: org.sonatype.nexus.common.collect.DetachingList cannot be cast to java.util.Set
 at org.sonatype.nexus.cleanup.internal.service.CleanupServiceImpl.findPolicies(CleanupServiceImpl.java:145)
 at org.sonatype.nexus.cleanup.internal.service.CleanupServiceImpl.cleanup(CleanupServiceImpl.java:99)
 at org.sonatype.nexus.cleanup.internal.service.CleanupServiceImpl.lambda$0(CleanupServiceImpl.java:89)
 at com.google.common.collect.ImmutableList.forEach(ImmutableList.java:407)
 at org.sonatype.nexus.cleanup.internal.service.CleanupServiceImpl.cleanup(CleanupServiceImpl.java:87)
 at org.sonatype.nexus.cleanup.internal.task.CleanupTask.execute(CleanupTask.java:46)
 at org.sonatype.nexus.scheduling.TaskSupport.call(TaskSupport.java:100)
 at org.sonatype.nexus.quartz.internal.task.QuartzTaskJob.doExecute(QuartzTaskJob.java:143)
 at org.sonatype.nexus.quartz.internal.task.QuartzTaskJob.execute(QuartzTaskJob.java:106)
 at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
 at org.sonatype.nexus.quartz.internal.QuartzThreadPool.lambda$0(QuartzThreadPool.java:143)
 at org.sonatype.nexus.thread.internal.MDCAwareRunnable.run(MDCAwareRunnable.java:40)
 at org.apache.shiro.subject.support.SubjectRunnable.doRun(SubjectRunnable.java:120)
 at org.apache.shiro.subject.support.SubjectRunnable.run(SubjectRunnable.java:108)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)