AvInstall fails with Accelerator-related error

Greetings! We've been busy with re-kickstarting an Avamar Gen4 grid with the latest Avamar ISO version at the Customer's site and got stuck at around 56% of AvInstaller installation with an error:

ERROR: ValidateNodeTypesMatchNodeDatabase::do ["node 0.accelerator.0 is wrongly set to type @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r should be accelerator"] operation failed

Not sure where to look. The Accelerator node was re-kickstarded with the type of "Accelerator", all the mandatory steps were complete and node type was changed to the type "accelerator" by the command change-nodetype. When I login to accelerator node I see a message that "This is an Avamar Accelerator Node". The node was correctly added to probe.xml file with the "nodedb --add" command and probe.xml contains this record:

Looks strange to me and I don't find any answers in any support materials. It would be very nice if someone could clear this situation for me.