symptom:
You are using the dashboard UI to check the permissions on an output bucket, it asks you for a path, you enter the path as folder1/folder2/folder3 and you receive the error :
The following permissions are missing on the bucket or on the path “older1/folder2/folder3”: ListBucket
Yet you believe the ListBucket permission is correctly set for that directory.
This is a known issue, simply change the path to read folder1/folder2/folder3/* instead (noting the trailing slash and star) and try again.