Tree pages created upon creation of a page from a tree template preserve the history of their corresponding template page

This issue is a limitation of the implementation of https://jira.xwiki.org/browse/XWIKI-12775 , but it's not clear to me if this limitation was there from its first version or whether the limitation was introduced afterwards. I reproduced on 12.6.5.

How to reproduce:

• create a tree template (template with some subpages) and a template provider for it
• make some modifications to the subpages of the template (such as to create a couple of entries of page history)
• make some modifications to the root page of the template as well (such as to create a couple of entries of page history)
• create a page from this template
• upon creation, the whole tree of pages of the template will be "copied" over to the newly created page

Expected result:

• All the pages in the tree of pages newly created have a single entry in the page history
• Creation dates and last modified dates correspond to the current date, when the create from template was done

Actual result:

• The root page created from the template has a single entry in the history, as well as correct dates:
  
• The subpages created from the template has all the history of the template, and some strange dates (in the history):