[Pkg-utopia-maintainers] Bug#1037941: SPA handle 'api.libcamera.enum.manager' could not be loaded; is it installed?

[AlMa]

Package: wireplumber
Version: 0.4.13-1

Somewhere deep in the log there are two error messages concerning camera:

Jun 13 21:00:21 AnonymizedMachineName kernel: si2157 20-0060: Silicon 
Labs Si2157 successfully attached
Jun 13 21:00:21 AnonymizedMachineName kernel: dvbdev: DVB: registering 
new adapter (cx23885[0])
Jun 13 21:00:21 AnonymizedMachineName kernel: cx23885 0000:08:00.0: DVB: 
registering adapter 1 frontend 0 (Silicon Labs Si2168)...
Jun 13 21:00:21 AnonymizedMachineName kernel: cx23885: 
cx23885_dev_checkrevision() Hardware revision = 0xd0
Jun 13 21:00:21 AnonymizedMachineName kernel: cx23885: cx23885[0]/0: 
found at 0000:08:00.0, rev: 4, irq: 16, latency: 0, mmio: 0x90200000
Jun 13 21:00:21 AnonymizedMachineName /usr/libexec/gdm-x-session[1154]: 
(II) Module glamoregl: vendor="X.Org Foundation"
Jun 13 21:00:21 AnonymizedMachineName /usr/libexec/gdm-x-session[1154]: 
        compiled for 1.21.1.7, module version = 1.0.1
Jun 13 21:00:21 AnonymizedMachineName /usr/libexec/gdm-x-session[1154]: 
        ABI class: X.Org ANSI C Emulation, version 0.4
Jun 13 21:00:21 AnonymizedMachineName rtkit-daemon[1158]: Successfully 
made thread 1188 of process 1146 owned by '119' RT at priority 20.
Jun 13 21:00:21 AnonymizedMachineName rtkit-daemon[1158]: Supervising 5 
threads of 3 processes of 1 users.
Jun 13 21:00:21 AnonymizedMachineName wireplumber[1148]: Failed to set 
scheduler settings: Die Operation ist nicht erlaubt
Jun 13 21:00:21 AnonymizedMachineName systemd[1095]: Reached target 
sound.target - Sound Card.
Jun 13 21:00:21 AnonymizedMachineName wireplumber[1148]: SPA handle 
'api.libcamera.enum.manager' could not be loaded; is it installed?
Jun 13 21:00:21 AnonymizedMachineName wireplumber[1148]: PipeWire's 
libcamera SPA missing or broken. libcamera not supported.

What is SPA? The package pipewire-libcamera is NOT installed; it seems 
to be not recommended or even suggested by any other package. So besides 
a guess based on the name (and pipewire-libcamera may or may not be 
relevant), there's no way of knowing how to get rid of this error.  So 
who is the culprit and what to do?

Gratefully,
AlMa