I'm glad to have you here in the Community, @Noxious.
The Match option is used to find similar transactions between the one you entered and downloaded from the bank. This is to avoid any duplicates hence needs also to use the same bank account.
You'll need to exclude the transfer to the payment in the different accounts to fix this.
However, I recognize your need for this feature, and I'm taking note of it so I can pass it along here on my end.
While there's no definite time on when this will become available, you'll want to learn how to match and categorize bank transactions in QuickBooks Online through checking this article: Match and Categorize bank transactions in QuickBooks Online.
You can also check out this site to get you in the loop about the latest product updates: Latest QuickBooks Updates.
Feel free to comment below if you've got any QuickBooks concerns. Take care and have a great day!