Delphi 12.x officially unsupported?

From TestComplete documentation https://support.smartbear.com/testcomplete/docs/app-testing/desktop/delphi/about.html#General it would seem that Delphi support is specific to the listed versions, and version 12 is not on the list. 

Since your problem manifested after upgrading from 12.1 to 12.2 can you consider going back to 12.1?

SmartBear maintenance agreement is restricted to TestComplete updates and what ever SmartBear deem feasible to enhance. Requesting from SmartBear to provide support to 12.x, in my mind may not be realistic or feasible for your project.