Calling the PageManager#deepCopyPage API throws a TransactionRequiredException with no transaction in progress

Issue Summary

There is a transaction issue with the PageManager#deepCopyPage and PageManager#updatePageInAncestorCollections API calls.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Attempt to call either
   • pageManager.deepCopyPage(pageCopyOptions, templatePage, (Page) parentPage);
   • pageManager.updatePageInAncestorCollections(templatePage, (Page) parentPage);

Expected Results

The API successfully moves or updates the pages provided  with no exception thrown

Actual Results

An exception is thrown

Caused by: javax.persistence.TransactionRequiredException: no transaction is in progress
at org.hibernate.internal.SessionImpl.checkTransactionNeeded(SessionImpl.java:3505)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1427)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1423)
at com.atlassian.confluence.impl.content.DefaultPageManager.removePageFromAncestorCollections(DefaultPageManager.java:610)
at com.atlassian.confluence.impl.content.DefaultPageManager.updatePageInAncestorCollections(DefaultPageManager.java:575) 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available