I created a brand new project from the HDRP template, and added just a plane and 8 identical spotlights. (And of course HDRP settings and scene settings.) Almost everything has default values. When I bake lighting, I see 2 spots in the lightmap (which are stuck, I guess they really were baked) and 6 lights which work (presumably real-time). Directionality and shadowmask also look odd with different lights in each one.