Jaspersoft impacts after 15.4 upgrade

Document ID : KB000107638
Last Modified Date : 23/07/2018
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Last week we upgraded our TEST environment (cppm2053-test.ondemand.ca.com) from 14.4.0 to 15.4.1 and we're trying to understand what we can expect to see as impacts in Advanced Reporting. One thing we've noticed is that all view and report dates now show a create date of July 10 (or 11th) which is when the upgrade occurred. Is this normal to lose all file history? What would be very helpful is a summary of Advanced Reporting updates that occur with the 15.4.1 upgrade, so that we know what to look for and what to test. We were already on Jaspersoft 6.4.2 prior to the upgrade so Jaspersoft itself was not upgraded.
once an upgrade is perform the existing organization is deleted and then repopulated resulting  report time stamps reflecting the upgrade date and not the date when the reports and view were actually created. The recommendation is to export the reports, views or the organization and post upgrade import it back this will retain the original dates.