Hitting this same issue as well. It definitely seems like it's iOS 14-specific in our case. I've tested the same app build on an iOS 12.5.1 device, an iOS 13.7 device and iOS 14.4 device. Automatic Strong Password Suggestion works perfectly on the first two, but fails on the iOS 14 device (with the same error message in the console that was mentioned above).
On our login screen, it does still offer to fill previously-saved login information. It's only Automatic Strong Password that's broken.
chrisfv
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