Response size in report and response streaming

[tsuni_ohsaki]

This post is related to https://www.googlecloudcommunity.com/gc/Apigee/Capturing-Response-size-with-response-streaming-ON/td...

I found response sizes are affected by response streaming.

I did an experiment; with and without response streaming shown below

<TargetEndpoint name="default">
...
    <HTTPTargetConnection>
        ...
        <Properties>
            <Property name="response.streaming.enabled">true</Property>
            ...
        </Properties>
    </HTTPTargetConnection>
</TargetEndpoint>

And my report shows significant differences in Response size:

The response size without streaming is very close to what I get from Postman.
My assumption was that response size monitoring is supported when response streaming is ON. Was I wrong?