Default alignfull on Group and Cover causes block validation error

I’m using the following code to default my Groups and Covers to be alignfull.

wp.hooks.addFilter(
    'blocks.registerBlockType',
    'bdc/wordexpresso',
    function( settings, name ) {
        if ( name === 'core/cover' || name === 'core/group' ) {
            return lodash.assign( {}, settings, {
                attributes: lodash.assign( {}, settings.attributes, { align: {
                  type: 'string', default: 'full'
                } } ),
            } );
        }
        return settings;
    }
);

And it does work, but it’s causing a JS error in the console on page load that I would like to ideally have go away. Even if it is functional code, I don’t like the idea of having console errors.

Block validation: Expected attribute class of value wp-block-cover alignfull has-custom-content-position is-position-top-left has-background-color has-text-color, saw wp-block-cover has-custom-content-position is-position-top-left has-background-color has-text-color.

I tried setting the default Class along with this hook, but that didn’t work. It’s not clear what I need to do to properly change the default alignment on Groups and Covers.