[ceph-users] Ceph Pacifif and Openstack Wallaby - ERROR cinder.scheduler.flows.create_volume

Hello! I'm working with Openstack Wallaby (1 controller, 2 compute nodes) connected to Ceph Pacific cluster in a devel environment. With Openstack Victoria and Ceph Pacific (before last friday update) everything was running like a charm. Then, I upgraded Openstack to Wallaby and Ceph  to version 16.2.1. (Because of auth_allow_insecure_global_id_reclaim I had to upgrade many clients... but that's another story...) After upgrade, when I try to create a volume from image,      openstack volume create --image f1df058d-be99-4401-82d9-4af9410744bc debian10_volume1 --size 5 with "show_image_direct_url = True", I get "No valid backend" in /var/log/cinder/cinder-scheduler.log 2021-04-26 20:35:24.957 41348 ERROR cinder.scheduler.flows.create_volume [req-651937e5-148f-409c-8296-33f200892e48 c048e887df994f9cb978554008556546 f02ae99c34cf44fd8ab3b1fd1b3be964 - - -] Failed to run task cinder.scheduler.flows.create_volume.ScheduleCreateVolumeTask;volume:create: No valid backend was found. Exceeded max scheduling attempts 3 for resource 56fbb645-2c34-477d-9a59-beec78f4fd3f: cinder.exception.NoValidBackend: No valid backend was found. Exceeded max scheduling attempts 3 for resource 56fbb645-2c34-477d-9a59-beec78f4fd3f and 2021-04-26 20:35:24.968 41347 ERROR oslo_messaging.rpc.server [req-651937e5-148f-409c-8296-33f200892e48 c048e887df994f9cb978554008556546 f02ae99c34cf44fd8ab3b1fd 1b3be964 - - -] Exception during message handling: rbd.InvalidArgument: [errno 22] RBD invalid argument (error creating clone) in /var/log/cinder/cinder-volume.log If I disable "show_image_direct_url = False", volume creation from image works fine. I have spent the last four days googling and reading lots of docs, old and new ones, unlucly... Does anybody have a clue, (please)? Thanks in advance! Javier.-