For each poudriere-devel run, it was reporting:
Warning: signal-desktop-7.84.0 will be rebuilt as it misses libpipewire-0.3.so.0 which no dependency provides.
The signal-desktop binary does indeed link to libpipewire-0.3.so.0.
% objdump --all-headers /usr/local/bin/signal-desktop | grep libpipewire
NEEDED libpipewire-0.3.so.0