When did change the way of access to deprecated metafields?

hey, there.

I have been used metafields object in liquid.(API version 2021-07)
I accessed the metafields object’s value with {{ resource.metafields.namespace.key.value }}.
But, I can’t access them with the same way since 12/10 12:00 Japan time (JST).

In the Shopify API Help Doc, the type of “Integer” is deprecated metafields, and they return the metafield value directly.
(https://shopify.dev/api/liquid/objects/metafield#deprecated-metafields)
So I fixed them to {{ resource.metafields.namespace.key }}.

When did the acquisition method of the type of “Integer” change?
I would like to know if there was a way to detect it in advance.

Best regards, Lee.