* KAddressBook doesn't show (sync) new entries, most (old) contact entries are available, although an attempt to re-login to the google account seems to be successful.
* Some contact groups show up multiple times (one contains items, the other is empty).
* Having selected the address book and all sub-folders (address groups), combining contacts attempts to combine all contacts, that appear in more than one group. Combining does work, if no sub-folders (address groups) are selected, and the selected contacts are limited to exactly this google account with sub-folders disabled.
STEPS TO REPRODUCE
Add Google account
Create a new contact
Sync address book
Query new contact
check google address sub-folders (address groups)
select google address book and all sub-folders (address groups) and combine similar contacts.
no new contact found
some address groups appear twice
combining contacts show too many entries
new contact show up after sync
every contact group should appear only once
combining contacts should ignore group membership
Linux/KDE Plasma: openSUSE TW 20190810
KDE Plasma Version: 5.16.4
KDE Frameworks Version: 5.60.0
Qt Version: 5.13.0