I believe you are correct.
I had fixated on the negative jump label and assumed the gst-plugin-scan was just noise.
Predefining the gst registry so plugin scan does not run appears to resolve the problem.
One of the major differences between this version and previous versions was the loss of ability to force on the adu_mclk via the sysfs.
This version starts a gstreamer pipeline very early to turn on aud_mclk, which would be the trigger for plugin scan.