I got it to do the same thing. It is totally normal. Shadows are not cheap to render. Looking into the building, you have all manner of objects near you, rendering with all their shadows. We do not have a static world where we can precompute visibility, so there is a lot of overdraw in that situation. Also, the occlusion manager does not disable shadows, as it does not know where they will be projected to and shadows are draw calls.
Yes. 2022 LTS should be out soon and I hope to have A22 using it.