We have an issue where we get shadow jitter in HDRP. Happens when the sun (directional light) gets moved, which causes the shadowmap to update. Tried a number of settings and corrections to no avail.
Well, ended up fixing it. Had to do with the (camera) lighting volume shadows - specifically the cascade count. Needed to be tweaked significantly. The closer splits need to be smaller, to fine tune the shadows you can see nearby.