When marked as paid manual order incorrectly reports as credit card when pm not specified

[jacoswan]

Describe the bug

When marked as paid, a manual order that didn't have the payment method specified, records itself as paid by credit card.

Here's an example from an existing WPCOM Biz site, which behaves the same as the Woo Express Essential site of the merchant that reported it in 7105093-zen

I'm struggling to reliably recreate this.

• CAN recreate on the merchant's Woo Express Essential and my own WPCOM Biz site
• CANNOT recreate on a brand new Woo Express, Pressable, or local host site

This is only visible in the Items metabox, and not, for instance, in the Orders list Billing column. It appears to take the first value from the Payment Methods dropdown you see when editing the Billing Address:

Expected behavior

When the payment method is not specified, it should just show as "Paid" with the date, as per this screenshot (from brand new Woo Express Essential site):

Steps to reproduce

1. Go to one of the affected sites
2. Create a manual order
3. Do nothing except add a product and save
4. Mark is as Completed

WordPress Environment

Merchant's site SSR (can recreate): 31f36-pb
My WPCOM Biz site SSR (can recreate): 31f37-pb
Brand new Woo Express SSR (cannot recreate): 31f38-pb

What plan is active?

Essential

[manospsyx]

@jacoswan odd one, thanks for opening!

CANNOT recreate on a brand new Woo Express, Pressable, or local host site

Could you please try to replicate this on a fresh local site with WooPayments active, or see what happens on a Woo Express site when WooPayments is deactivated? Thanks!