Comment # 1 on bug 1227408 from Edgar Aichinger

I can confirm the bug, I investigated a bit more and can add a few
observations/comments:

It only happens when exporting ranges or whole sessions, exporting regions via
context menu works without issue.
It only happens with pipewire-jack, using Ardour's jack backend. Switching to
ALSA backend, also after replacing pipewire-jack by jack/libjack v1.9.22 the
exported file sounds fine. 

The pipewire packages I was using are from MM:Libs (I assume the ones in OSS
repo will show the same).

To me it seems this is an upstream pipewire bug.