There's a bug in preview. If you don't preview first, or "undo" the preview step, and just hit the merge button it should be fine.
Thanks Peter! It still exports incorrectly, though.
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Close and reopen the template file and try again without the preview step.
Restarting didn't do anything, but you inspired me to just start a new file. I copied my text box and pasted it into a new one, linked the data and it works!
Frustrating experience. If it was from me previewing at some point, I really hope they fix that bug.