Upgrades - Notifications count appears in Portal but entries are not found after upgrading from 6.2 to 7.0 DXP

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.1 CE GA2
• Fix Version/s: 7.0.1 CE GA2
• Component/s: Collaboration, Collaboration > API > Notifications, Collaboration > Upgrade
• Labels:
  • KNOWNISSUES_DE70
  • LR7UPGRADE
  • collab-upgrades
• Fix Priority: 5
• Sprint: Calciocelsian
• Git Pull Request: https://github.com/migue/liferay-portal/pull/779

Steps to reproduce:

1. Using the attached sqldump, upgrade Liferay 6.2 to 7.0 DXP. Alternatively, create some notifications in 6.2.10.15 Portal and save the dump file and upgrade using that.
2. Start and log into portal
3. Assert a notification count appears next to the user avatar and in the control menu
4. Click on My Account > Notifications

Expected results:
A list of notification(s) appears, detailing what triggered each notification.

Actual results:
No results are found. The container displays the message "You do not have any notifications."

Reproduced on:
Tomcat 8.0.32 + MySQL 5.6.
Portal 7.0 DXP B2