After that I though to upgrade to Veeam Backup and Replication 9.5 and nightmare starts, all my nightly backups starts failing with below error messages..
"Task failed Error: Support for vSphere 6.5 requires Veeam Backup & Replication 9.5 Update 1 or later"
As per Veeam forum many users are facing this issue with ESXi 6.5 and Veeam 9.5. As per Veeam they are planning to release update 1 but no release date update.
So for time being only solution is available to solve this issue is to rolling back to Veeam backup 9.0 Update 2 until Veeam backup 9.0 Update 1 release.