[BUG]get_anndata retrieves 0 cells

adata = cellxgene_census.get_anndata( census, organism="Homo sapiens", obs_value_filter="tissue_general == 'liver'", obs_coords=slice(0, 1000), # X_name="normalized" ) got adata.shape == (0, 61888) but， obs = cellxgene_census.get_obs( census, organism="Homo sapiens", column_names=["tissue_general","tissue","cell_type"], # value_filter = "tissue_general == 'liver'", # coords=slice(0, 1000), ) obs["tissue_general"].value_counts().loc["blood"] == 2676941 I cannot get data using get_anndata. Besides，when i use : obs = cellxgene_census.get_obs( census, organism="Homo sapiens", column_names=["tissue_general","tissue","cell_type"], value_filter = "tissue_general == 'liver'", coords=slice(0, 1000), ) i only got 711 liver obs_data. why not 1000?(1000<2676941)