AEM 6.4 Granite shows JS error _EditableUtils when authoring editable templates
We're running an instance on AEM 6.4.6.0. The authoring interface does not load anymore when attempting to author editable templates. It shows the following JS error: TypeError: ns.ContentFrame._EditableUtils is undefined
Using the debugger, I can see that this function is affected, which seems to be Granite built-in:
ns.ContentFrame._EditableUtils.shouldFilterEditable = function (editable) {
return !!editable
};
The problem occurs with and without minification. Any ideas?