hi,
i have never experienced that issue with rclone+wasabi.
you are sure the issue is with wasabi, not the on=prem s3 server?
have you contacted wasabi tech support?
i found a wasabi bug, they have yet to fix it but they were quick to test and confirm the bug.
https://forum.rclone.org/t/in-some-cases-rclone-does-not-use-etag-to-verify-files/36095/11?u=asdffdsa