I have experienced this bug in Google Domains before (for non Google related domain names). Interestingly, it seems to particularly affect domains that are regi

I have experienced this bug in Google Domains before (for non Google related domain names). Interestingly, it seems to particularly affect domains that are registered but unused. This isn't isolated to Google Domains, however. GoDaddy's website let me go through the entire checkout process with 2 or 3 registered domain names, followed by a refund an hour later.