iOS autofill consistently gives me a random email that I've never used

Question

My personal emails never show up as an Autofill suggestion. Instead, some random [email protected] is used instead, which I have never seen before.

Is Chris Willis some default email suggestion from iOS? If so what is the point of that and why are my own emails not showing up?

I have already enabled AutofillCredentials as an entitlement and my autofill group uses the following format

AutofillGroup(
  child: Column(
    crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        //...
          TextField(
            autofocus: true,
              controller: _email,
                autofillHints: const [AutofillHints.email],
                    keyboardType: TextInputType.emailAddress,
                    textInputAction: TextInputAction.send,
                    autocorrect: false,
                    enableSuggestions: false),
                    // ...