User loses expando values when deleting a page with the same ID as the user

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, Master
• Fix Version/s: 7.2.X, 7.3.X, Master
• Component/s: Portal Services > Expando
• Labels:
  • ee-ts
• Branch Version/s:
  7.3.x, 7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/2174

Steps to reproduce:

Add at least one custom field for pages.
Add at least one custom field for users.
Create a page.
Create a user.
Modify the Primary Key of the page (and also every occurence of the value!) in the DB to match the userId of the user.
Delete the page.

Actual behavior:
The custom field values are deleted for the user as well (it can be seen in the expandovalue table).

Expected behavior:
The custom field values are not deleted for the user, only for the site.