To make the changes working, we need to modify line 259 of verify.py to call the appropriate (new) method. This patch works for me:

diff --git a/bob/bio/base/script/verify.py b/bob/bio/base/script/verify.py
index f26bf69..c8857c2 100644
--- a/bob/bio/base/script/verify.py
+++ b/bob/bio/base/script/verify.py
@@ -259,7 +259,7 @@ def execute(args):
     tools.preprocess(
         args.preprocessor,
         groups = tools.groups(args),
-        indices = tools.indices(fs.original_data_list(groups=tools.groups(args)), None if args.grid is None else args.grid.number_of_preprocessing_jobs),
+        indices = tools.indices(fs.original_data_list_files(groups=tools.groups(args)), None if args.grid is None else args.grid.number_of_preprocessing_jobs),
         allow_missing_files = args.allow_missing_files,
         force = args.force)