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d8d76ff647
After the multipart chunker refactor the multipart chunked server side copy was accidentally sending one part too many. The last part was 0 length which was rejected by b2. This was caused by a simple off by one error in the refactoring where we went from 1 based part number counting to 0 based part number counting. Fixing this revealed that the metadata wasn't being re-read for the copied object either. This fixes both of those issues and adds an integration tests so it won't happen again. See: https://forum.rclone.org/t/large-server-side-copy-in-b2-fails-due-to-bad-byte-range/42294