Lost Dashboards after upgrading to the 7.5.2

After the Upgrade from Chart version, 5.8.16 to 6.7.1 (App versions 7.2.1 to 7.5.2) Lost all the dashboards and Azure Active Directory users as well
Steps:
Currently, Chart version 5.8.16 is using Helm2, Converted the existing to chart to Helm3, and directly upgraded to most recent chart version.
I haven’t done the incremental upgrade.

Thanks in advance