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When I cloned the form and inserted a second PDF tag under the orange colored one in the notification, the link showed up for the one I inserted while nothing was displayed in the place of the original one:
Here's what I did in the form builder:
And here's what showed up in my inbox:
(Mine is labeled "Second PDF link". I blurred part of the link for privacy.)
I also tested the link to ensure that it contained the info submitted. It did.
So, I would recommend deleting your current tag and replacing it with a new one.