Bluetooth OnePlus earbuds not working

[Colin Law]

Running Ubuntu 22.04 I am able successfully to connect to some
bluetooth audio out devices but it will not connect to my OnePlus Buds
Z2.  When I tries to connect I see in syslog

Dec 20 11:31:43 tigger bluetoothd[1930]: src/device.c:load_gatt_db()
No cache for 47:6E:A2:2D:D6:B3
Dec 20 11:31:44 tigger pulseaudio[2754]: Device property 'Address'
expected to be constant but changed for
/org/bluez/hci0/dev_47_6E_A2_2D_D6_B3, ignoring
Dec 20 11:31:49 tigger bluetoothd[1930]: src/device.c:search_cb()
47:6E:A2:2D:D6:B3: error updating services: Host is down (112)

Then it shows as connected in Settings > Bluetooth but does not work.

i have googled and not found anything that appeared relevant.  It is a
Fujitsu Lifebook A544 with (I believe) the latest BIOS (2.25).   The
buds do work with my phone.

Any suggestions as to what I should try?

Colin L.