Problem with too little span

[s-ooe]

Hi

We are using newFangle on a cloud service built with perl.
When the load of the service becomes somewhat high, NewRelic's distributed trace, there are many requests with spans=1, as shown in the figure below.

Under normal circumstances, there should be about 100-200 spans in this request.
Is this a problem with NewFagnle?
I have read the source of newFangle,newFangle::App but could not find any such control.
I think it could be either C-SDK,newrelic-daemon.

I emailed jjatria directly a few days ago with a question about the same issue.