KAddressBook CardDAV not picking up phone numbers or email addresses from Fastmail

I’ve successfully added and synced contacts from Fastmail over CardDAV using the manual URLs described in this Fastmail documentation for an unrelated client.

Names, street addresses and birthdays have all come through fine but phone numbers and emails have not when I view the contacts in KAddressBook.

Does anyone know how I could fix and/or debug this? :slight_smile:

Version 5.23.3 (23.04.3)