Problem after Update to 2.1.1 with Data loss

Hello.
I have read that many users have faced issues with the upgrade. My issue is that upgrade haven’t caused just functionality issues but also data loss.
When I’ve upgraded and was prompted to replace the object-cache.php, then everything seem normal.
Though all the new orders on the website, plus the products data that were running via API import were wrong. Orders are blank (only a few custom meta fields were saved) but lost total billing/shipping data. Like we lost the WC_Order properties.

Even reverting back, I cannot find these data, also checked DB and they were erased as well, even wc_mail logs have empty orders etc.

I had to rollback my website to an older backup

I guess those data are lost for ever.