Both devices have -90 degrees mounted panels but they don't have the
quirk in kernel.
The Pocket 4 has been researched and it has an acpi accel matrix that
works when setting panel orientation at boot parameter.
The Pocket 3 hasn't been tested, but given it didn't had panel
orientation quirk is for sure that matrix is wrong for it.
Actually is pending the quirks for both devices in kernel but eventually
they will get merged. Till that happens is encourage that owners of
these devices set panel orientation boot parameter to right-up.