What you are doing is perfectly correct. Unfortunately there is a bug introduced with the bigsur update.
The crawling / marching ants marking a selection boundary do not show. https://gitlab.gnome.org/GNOME/gimp/-/issues/5952
The selection is still there. You can see it if you toggle quick mask.
There is a new MacOS Gimp 2.10.24 release announced: https://twitter.com/GIMP_Official
Chances that it fixes the bug. Not very probable. If it does let us know.
The crawling / marching ants marking a selection boundary do not show. https://gitlab.gnome.org/GNOME/gimp/-/issues/5952
The selection is still there. You can see it if you toggle quick mask.
There is a new MacOS Gimp 2.10.24 release announced: https://twitter.com/GIMP_Official
Chances that it fixes the bug. Not very probable. If it does let us know.