@AastaLLL sorry to bug you, but is this issue on your development horizon? If at least the CPU backend were functionally identical to opencv SGBM compute method, we could use it for some projects.
This issue is fixed (cuda backend) in the VPI 1.1.
You can find the package from JetPack 4.6 already.
I installed SDK Manager 1.7 to use vpi1.1. In sdk manager at target operaing system, I see there is No available releases for ubuntu 20. How to update vpi from 1.0 to 1.1 on ubunut20 ?