Backups with rclone backend freeze at "verifying files"

duplicati-2.0.5.101-2.0.5.101_canary_20200123 works for me with other backends, but when using cloud storage via the rclone backend, the process freezes at the “Verifying files” stage.

The backup files actually are made locally, and do get transferred completely to the cloud storage… but duplicati seems unable to complete the last verification step

Any ideas?