Hi All,
if it helps anyone, I have somewhat the same issue. When scanning NFC tags in automation app or NFC tools, it never fails. If I try then to read the NFC tag with the my phone, it doesn’t work. One solution I found is to lock the phone, and with the screen off, position the iPhone over the nfc tag, and press the side “wake” button. It reads 100% of the time for me.
hope it helps.