Gutenberg featured image checkbox – checkbox not correctly set on editing page reload

I think the problem might be that the spread operator is missing in a couple of places. This line:

return {
     meta: { currentMeta, editedMeta },
};

in withSelect should be:

return {
     meta: { ...currentMeta, ...editedMeta },
};

This makes the meta object be a copy of currentMeta (have all the same properties and values), but overwrites them with any that are present in editedMeta.

There is a mixture of ES5 and ES6 syntax in the code, so if that doesn’t work you can achieve the same thing with ES5 by doing:

return {
     meta: Object.assign( {}, currentMeta, editedMeta ),
};

Also in withDispatch the same technique is being used to update the meta object, so that will need changing to:

       updateDisableFeaturedImage( value, meta ) {
            meta = {
                ...meta,
                disable_featured_image: value,
            };

I’ve not tested this so there might be other problems, but hopefully, this will get you a step closer. Good luck!