Thank you for your report.
I think this environment is very strange.
src/dest file's modified timestamp are not same.
src/dest file's creation timestamp are same.
What is your destination filesystem?
I recommend you to correct your filesystem behavior.
(I don't know why modified date is not saved in your environment)
But the soluion that is not recommended exists.
This change will compare date by creation timestamp (not modified timestamp).
[main] default_copy_flags="32768"