I did some more testing.
It certainly has the symptoms of snaking; you can see that the problem starts with un-commanded rudder movements.
In fact, I sometimes come out of the "manoeuvre" with the rudder jammed hard over to one side; so we've got over-balance as well.
Looking in the cockpit, there is also aileron buzz - the stick is vibrating from left to right pretty fast.
This might be caused by the snaking, or it might be a separate event.
It's probably covered by the "flutter" tickbox in the realism settings, but it's not exactly what I'd call classical flutter. It's a control system problem.
I suppose I should investigate what other aeroplanes do in high speed dives too...
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