I assume you mean on the storagenode side?
Yes, there is a correlation. I believe before the update 95 uploads were started and after 80 were done the remaining 15 were cancelled. Now 110 are started and 30 of them cancelled. So that’s already a doubling of the context cancelled amount. But for some nodes the impact may be much higher. If you consistently came in as around the 20th to last node to finish the transfer, you would have succeeded with the previous settings but you fail with the new settings.
Have you tried skipping the third party clients and just using the AWS CLI? Do you see the same issues that way?