CSM + FFR + Vulkan on 4.23.0 = glitches on Quest

Testing Vulkan on some projects. In one project I have;

- a stationary Directional light + cascaded shadows enabled -> needed due to moving machines.

- a static Skylight

For perfomance, some level of FFR is needed.It all works fine on the Quest when Vulkan is not enabled. Enable Vulkan and many glitches appear in the cascaded shadows.

Anyone noticed the same? Just reported @ Epic. Waiting to see if they can confirm as a bug.

Tested on the latest 4.23.0 OC branch.