There were two issues conspiring to prevent most BKE_reports from
surfacing when loading a file from the command line.
The first is that the "print_level" was left initialized to only
RPT_ERROR which prevents this particular warning from being traced to
the console.
The second is that, in order for us to display reports in the
notification area, we need to give the reports to the window manager.
This is typically all wired up during normal operator execution, but not
when just starting up from the command line.
Pull Request: https://projects.blender.org/blender/blender/pulls/147251
8a99ab4463