I've tried ACC a few times and as already posted, it failed, unnecessary braking when overtaking and I now use LIM in average speed zones
I've noticed this behaviour on my test drive in 2023 with a pre-facelift Jazz as well: It is quite annoying!.
My (Honda) MY24 Jazz has never done this; Honda must have made some improvements with the facelift.
Agreed, ACC has its limits but on the facelift seems to do a better job than on the original MK4s.