Do you think it could be that you copied my 3.3.8 code and used it for your version?
If you want to implement this mod, I would recommend going into your original products file and manually adding the tags. If you were using 3.3.8 you may be able to shortcut by copying the code but across release versions it is bound to have issues.
I only provided my products code to show all of the instances where I had to add the tags.
Good Luck!
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