Try without rasterio.

hls_burn_scars.py

@@ -90,6 +90,6 @@ class HLSBurnScars(datasets.GeneratorBasedBuilder):
             if filename.endswith("_merged.tif"):
                 annotation_filename = filename.replace('_merged.tif', '.mask.tif')
                 yield idx, {
-                    "image": {"path": filename, "data": rasterio.open(filename).read()},
-                    "annotation": {"path": annotation_filename, "data": rasterio.open(annotation_filename).read()},
+                    "image": {"path": filename}, #, "data": rasterio.open(filename).read()},
+                    "annotation": {"path": annotation_filename}#, "data": rasterio.open(annotation_filename).read()},
                 }