because there are a million potential "reasons". i ran an a1 for a week and a half and i'm an "experienced dog sport photographer" and i wouldn't say i was qualified to say for sure something was or wasn't a problem with the camera.
i think until people really learn the camera, it's hard to say how it should be set up for any given task, and then if something is or isn't a problem.
i'm not dismissing it as "wrong", but i'm saying there's much more that we don't know than we do know, and i'm getting a bit tired of these "i pointed the camera at something with random settings, and OMG!".
[sorry for being a fuddy-duddy]
Remember how the Z9 focused on the colourd subject in the falling snow and the A 1 didn't, to me its to do with colour detect that Nikon uses, its a positive thing.
In this case of the white bird i feel its highly likely a setting issue and as once said before that the setting of 5 wasn't quite strong enough in certain situations.
In all my life i have never experienced this issue regardless of camera and for the love of me why would you even use tracking in the first place on this style of shot, unless it was to verify an issue that i feel is more likely related to a setting error.
I have seen this kind of tracking of a white bird and the tracking stuck so why the inconsistency.
This is why the D6 is stickier in sports action compared to the A1 and there for will be in the Z9.....i believe this to be a realistic assumption.
As i said right in the beginning, i am shooting the Z9 as i do the D850 D5 D6, then step by step i am exploring each and every feature option setting, yes one at a time, then cross referencing it to the manual..so its all sinks in.
Far to many of us are quick to jump in a fast race car............ pedal to the metal, then complain about the steering brakes headlining or crash it and blame the car.
I am seeing people now using tracking in some sensable situations and more so in just mindless applications and cant understand why..............