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Joining items across z_indices can interfere with light culling for lights which only affect certain z ranges. This PR disables joining across z_indices when lights are present, except specifically for lights with both z_min set to the global minimum (-4096) and z_max set to the global maximum (4096). In addition, the z_index is now stored on the joined_item for accurate light culling. The z_index is also displayed in frame diagnostics.