Register 404 Condition in Breakdance builder

add_action("breakdance_register_template_types_and_conditions", function () {
    \Breakdance\ConditionsAPI\register([
        "supports" => ["element_display", "templating"],
        "slug" => "is-404-condition", // Ensure this slug is unique
        "label" => "404 Page",
        "category" => "WordPress",
        "operands" => ["is", "is not"],

        "values" => function () {
            // Provide only the relevant, functional option
            return [
                [
                    "label" => "Page Status",
                    "items" => [
                        // This single option indicates the condition of being a 404 page
                        ["text" => "404", "value" => "true"],
                    ],
                ],
            ];
        },

        "allowMultiselect" => false, // Multiselect doesn't apply to this boolean condition

        "callback" => function (string $operand, $value) {
            $is_404 = is_404(); // Determine if the current page is a 404
            if ($operand === "is") {
                return $is_404 === ($value === "true");
            } elseif ($operand === "is not") {
                return !$is_404 === ($value === "true");
            }
            return false;
        },
    ]);
});