_shopify_sa_p : Not getting shopify cookie value on thank_you page

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We were fetching the query string data from the following cookie.
It was working fine until the last couple of days. But suddenly we are not getting the query string data in it anymore on the thank_you page on the Shopify store.
Ref parameters that we are supposed to get in _shopify_sa_p cookie are available on all other pages except for the thank_you page. Is there any recent change in the Shopify store due to which this is happening?

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