I had the same problem with ios 14 beta 3, where NFC tag would work intermitantly, then with beta 4, they stopped working altogether. I submitted the problem to Apple, praying it would be fixed, and hey presto, beta 5, and the NFC shortcuts are working again... properly. Tried 6 different set ups and there all fine.
Obviously they must have had a lot of feedback.
Akanaten
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