seems to me that dragondisk is not creating the empty folder, but ceph itself is.
s3 does not any concept of a folder.
ceph is not s3 and perhaps it has a concept of a folder and allowing empty folders to exist.
different software 'creates' a s3 'folder' in different ways.
TLDR: ncw is awesome!
recently, i ran into a problem.
rclone had one definition of a folder
and
cloudberry/wasabi had a different definition of a folder
rclone considered that 'folder' created with cloudberry/wasabi to be a file with no name and of zero size.
ncw saved the day, he created a beta that fixed the problem, that will be merged in v1.52.
you can read all about it here.