Thumbnails in notebooks don't show note....

Thumbnails in notebooks don't show note....

After my migration from Evernote, inside the notebooks - any .pdf note (over 1,000) only show a red label with a paperclip and ".PDF".  After I open the .pdf note, then a correct summary of the note is shown. I'll attach a screenshot below.

Also, on every note I imported, there is a 2nd note attached behind it (and it is empty). Why?

Thanks!

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