GIMP Version:
Operating System: Mac OS
GIMP Experience: Experienced User

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Debugging GIMP (with respect to python plug-ins) seems to be difficult:
Succeeded in a Terminal calling:
peterkhgragert@Peters-MacBook-Pro:/Applications/GIMP-2.10.app/Contents/MacOS$ ./gimp

But with a lot of ERROR messages, e.g.
Cannot spawn a message bus without a machine-id: Unable to load /var/lib/dbus/machine-id or /etc/machine-id: Failed to open file “/var/lib/dbus/machine-id”: No such file or directory
GIMP-Error: Failed to load data:

Error loading '/Users/peterkhgragert/Library/Application Support/GIMP/2.10/patterns/dammen_black.pat.gfig': Unrecognized image file format

GIMP-Error: Failed to load data:

Error loading '/Users/peterkhgragert/Library/Application Support/GIMP/2.10/patterns/dammen_white.pat.gfig': Unrecognized image file format

^^^ that error message is clear its a different pattern with gimpfigure on it, changing to gig_dammen_white.pat removes THAT error

Critical one look like:

(gimp-bin:12485): GLib-GObject-WARNING **: 09:30:13.804: invalid cast from 'GtkMenuBar' to 'GtkWindow'

(gimp-bin:12485): Gtk-CRITICAL **: 09:30:13.804: gtk_window_add_accel_group: assertion 'GTK_IS_WINDOW (window)' failed