CoreNFC does NOT support Mifare Classic 1K, so we've created the Mifare Classic Tools for iOS - MTools Lite app, which can use an external BLE Reader to read/write Mifare Classic 1K card.
It also supports reading or writing NFC tag and transportation card which has SAK under 20 and 28.
Checkout MTools Lite on App Store
Whywilson
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Same happened to me.
Still previous icon on multitasking icon even after uninstallation and installation again.