Files incorrectly flagged as modified

Here we go - old metadata:

{"win-ext:accessrules":"[{\"Rights\":1179785,\"ControlType\":0,\"SID\":\"S-1-1-0\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0},{\"Rights\":1180063,\"ControlType\":0,\"SID\":\"S-1-5-21-3567941941-338316017-65753321-1000\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0},{\"Rights\":1966591,\"ControlType\":0,\"SID\":\"S-1-22-2-1000\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0}]","win-ext:accessrulesprotected":"True","CoreAttributes":"Archive","CoreLastWritetime":"637451221445148041","CoreCreatetime":"637451221445148041"}

New metadata:

{"win-ext:accessrules":"[{\"Rights\":1179785,\"ControlType\":0,\"SID\":\"S-1-1-0\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0},{\"Rights\":1180063,\"ControlType\":0,\"SID\":\"S-1-5-21-3567941941-338316017-65753321-1000\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0},{\"Rights\":1966591,\"ControlType\":0,\"SID\":\"S-1-22-2-1000\",\"Inherited\":false,\"Inheritance\":0,\"Propagation\":0}]","win-ext:accessrulesprotected":"True","CoreAttributes":"Archive","CoreLastWritetime":"637451221445148041","CoreCreatetime":"637451221440741761"}

The only difference is CoreCreatetime changed from 637451221445148041 to 637451221440741761. The file has not been accessed in any way other than the backup task. Does this help?

(in my previous, deleted post, I had outlined how I was unable to reproduce the error, but I tried again and the error is back. Hence this post)