Version: 70.0.3504.0 (Official Build) canary (64-bit) (cohort: Clang-64)

Navigate to kickstarter.com
On a project page, click "Back this project"
Sign in or continue as guest and select a backing level
On the checkout page, select the CC number field and trigger autofill
Select a GPay card
Enter the card's CVC in the CVC prompt
Autofill only fills the CC number and exp date fields

Autofill should fill the CVC and cardholder name fields too.