I've just committed a fix to the 4.2 branch of the Spine Runtimes that I verified fixes the crashes when you double-click on JSON in the inspector. I also tested making sure that you can do File > Open in the Script editor.
I tested this against 4.6.1-stable (GDExtension/engine module build), 4.5.1-stable(GDExtension/engine module build), and 3.6.2 (module build).
New builds should be up soon.
