Unsure which update caused this but I'm currently running:
Grav 2.0.20
API 1.0.20
Form 9.1.22
Typhoon 4.3.10
Above every field on the rendered contact form (including spacers, honeypot, and captcha etc) I'm seeing text like this:
data-grav-field="text" data-grav-disabled="" data-grav-default="null" type="text" class="form-input " placeholder="Enter your name" required="required"
Quite a bit of this additional text on the form, but it does still accept submissions and the received email looks correct.