Flag value mismatch after backup and restore while doing create,update,delete operations

Build: 3.0.0-628-rel
Load 2 kinds of items into the cluster with different key value prefix. Then do
mutations on part of the items according to clients' input param. After backup,
delete the existing buckets then recreate them and restore all the buckets. Verify
the results by comparison between the items in KVStore and restored buckets items. There is a mismatch in the Flag values.

Script: testrunner/pytests/CreateUpdateDeleteBeforeBackup.

Also please find the attached log files from the server.