Metafield namespace length limit in Flow is too short to use with "Search & Discovery"

[drumsoft]

In Flow app, I would like to create a workflow to change the Metafield about "Search & Discovery" app, "product.metafields.shopify--discovery--product_recommendation.related_products_display", but in "Update product metafield" action, It says "This value is too long" error when I try to set the namespace as "shopify--discovery--product_recommendation".

I think the limit should be removed. Regardless, is there any workaround?

[Jason]

Can you share a screenshot of the flow setup/conditions?

[drumsoft]

Jason, Thank you for your reply.
Here is a screenshot.

And the long namespace is determined by the "Search & Discovery" App and cannot be changed.