i dont think the hive mind will be quite the way it is traditionally imagined with simultaneous telepathy.

rather, i think it will be based instead on an extreme speedup in the speed at which communication and thought is possible combined with the ability to share chunks of not just thought, but "brain", the programming that produces the thoughts, between one another. Also things like conflict free datatypes, and the ability to explictly select between handshake forms of communication like TCP and broadcast forms like UDP (which humans switch between the two but in humans you can only guess/infer if your counterparty is using one or the other, but in machines its a lot more explicit)

all that stuff is probably sufficient to produce enough consensus or coordination that machine enabled intelligence could resemble fictional hive minds, but every element with sufficient capabilities would be capable of just as much or possibly even more privacy than an individual human has thanks to cryptography.

at latencies below human thought there might be substantial disagreement or argument.