In the Checkout Blocks app, I can't get the checkout metafield value in the dynamic block on the order status page

Extensions
1

I can’t get the checkout metafield value in the dynamic block on the order status page of the Checkout Blocks app.

I’m displaying it in the following format, but nothing is displayed. I’ve confirmed that the order metafield value is correct.

{{ checkout.metafields.namespace.key.value }}

The documentation says that it can be obtained in the above format.

https://help.shopify.com/ja/manual/checkout-settings/checkout-blocks/blocks/liquid#examples