I disagreed with the bickering about "seamless" and "blip" which was not adding anything to this discussion.
Also, in my house, with my setup, the information I provided is "correct" for me. If my powerwalls are 90% and I flip the breaker my PV does not go off. That isnt relevant for your setup, but its relevant for mine, so for me, its "correct".
My experience is the same as @jjrandorin. If my Powerwall is below 96% my PV stays on 100%. I have my PV system configured for reduced power at high frequencies and the PV drop off happens at around 96%+.
I have not tested (but should at some point) how much of a blip there is at each scenario ie < 96% and > 96%. Anecdotally my Powerwall stays full (backup only mode) and I do notice blips and the PV cuts out when the grid goes down.