Field options are now validated by default. To revert this, use this code example.

add_filter( 'frm_option_is_valid', '__return_true' );

Use this code snippet to add an exception for option validation when using the Formidable REST API to create or update entries.

add_filter('frm_option_is_valid',
    function( $valid ) {
        if ( ! $valid ) {
            $uri = FrmAppHelper::get_server_value( 'REQUEST_URI' );
            if ( 0 === strpos( $uri, '/wp-json/frm/v2/entries/' ) ) {
                $valid = true;
            }
        }
        return $valid;
    }
);

Use this code example that will allow you to add exemptions only for specific field IDs.

add_filter( 'frm_option_is_valid', function( $is_valid, $value, $field ) {
    if ( ! $is_valid ) {
        $field_id_exceptions = array( 1, 2, 3 );
        if ( in_array( (int) $field->id, $field_id_exceptions, true ) ) {
            $is_valid = true;
        }
    }
    return $is_valid;
}, 10, 3 );