GTM for Product Page View Not Firing for Certain Products

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Shopify Partner
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We maintain our tags on GTM and currently tags (for different platforms i.e. Facebook, Analytics, Adwords) related to product page view are not firing for some products. I can see for these products "undefined" is returned instead of product information. All products use a single product.liquid template and here's the data layer definition:

 

 

The tag setup on GTM:

 

When on GTM preview mode, although using the same template, this is how it looks for two products:

 

I tried talking with Shopify support as it seems to be product-specific issue. Unfortunately they weren't able to provide much insights and suggested posting on this forum instead.

Hope someone can help with this.

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