The Acronis RnD team was able to reproduce the issue and it becomes a known issue and they would work on it and the fix would be available in an upcoming version c21.06.

RnD team suggested a workaround:

1. Disable dl hooks from the registry:

[HKEY_LOCAL_MACHINE\SOFTWARE\SmartLine Vision\DeviceLock]
"hookerdisabled"=dword:00000001

2. Change parameter from "start printing after last page is spooled" to "Print directly to the printer" in printer settings on the Lacerte Tax PDF Printer Properties on the Advanced Tab.