Iperf3 3.18 version inconsistent results
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Description
I have this iperf3 test that is done between a server and client, but the results are not consistent between the two entities regarding total packet sent (6276 and 6277 on total).
*The session is being run in reverse mode.
*Client is running 3.18, and server is running version 3.7 of iperf3.
*Using 3.10 client and 3.7 server doesn't have this issue. Using 3.18 client with 3.18 server does have this issue.
Client Side:
*Arguments --bitrate 10.0M, --ulength 2000 (fragmentation enabled with intent).

Server side:

I took a look at this [discussion](https://github.com/esnet/iperf/discussions/1541), but the env that I'm using doesn't buffer anything.
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