Veritas wrote yesterday 08.27. 2020:
We have received update that Netbackup 18.104.22.168 expected date of release for general availability would be around third week of September, 2020. It is the first maintenance release for NBU under the current tooling infrastructure. So in order to fix this issue as soon as possible we suggest you to reinstall NetBackup 8.2 and perform a full catalog recovery as HPE support have already verified that this is a compatibility issue of HPE Catalyst plugin with Netbackup version 8.3 and they have the HPE plugin compatible with next NBU release 22.214.171.124 but it will take time (September 3rd week, 2020).
HPE OST plugin stops working after upgrading to NetBackup 8.3 using HPE StoreOnce Catalyst plugin 4.2.2.Error Message
# cat /usr/openv/hpe/ost/logs/plugin.log
2019-12-04 19:11:16.309401 (local 11:11) : ERROR : 179745_3168298880 : -1 : - : Global : stspi_init : Ln 331 : OST API version 12 NOT SUPPORTED
HPE's plug-in checks versioning and doesn't load when it encounters the v12 in NB 8.3.Solution
Veritas Technologies LLC currently plans to address this issue by way of a patch or hotfix to the current version of the software. Please note that Veritas Technologies LLC reserves the right to remove any fix from the targeted release if it does not pass quality assurance tests. Veritas’ plans are subject to change and any action taken by you based on the above information or your reliance upon the above information is made at your own risk.