…since I’ve accumulated a couple of queries on this, it’s probably a good thing to clarify.

The restriction on taking tangle (and certain other members of its family of technologies) through a stargate arise from the details of the Minovsky Physics I have defined to fill in the handwavium gap between ontotechnology and our understanding of the universe. I’m not exactly ready to give a full primer on the details of those, heh, but here’s the relevant parts:

• From a quantum-physics-interpretation perspective, the three competing current Theories of Everything are equivalent to a non-local-hidden-variables interpretation. (In short, I’m assuming that some version of NLHV is correct.)
• All of these imply “privileged channels” – this is a metaphor – by which state information is “teleported” – this is an even worse metaphor – about the place.
• I draw from various ideas I have seen in the scientific literature relating quantum entanglement to the quantum foam to thus associate these “privileged channels” with the foam-scale wormholes.
• (Some of this may seem familiar to those who’ve paid attention to the revealed technical details of stargates. If you also notice some inspiration from Greg Bear’s conphysics in Moving Mars and Anvil of Stars, that’s probably fair to say.)

What does this mean for tangle? Well, it means that for those “privileged channels” to function, they require coherency. Ordinarily, this is a given – we, at the macroscale and even the particle nanoscale, all operate in a nice, consistent spacetime geometry, if one that’s interestingly distorted in places. But then there are stargates, which blow up a wormhole to macroscopic proportions, allow transit, and then collapse it, pinching it off. That breaks coherency because it changes the spacetime topology, not something that normally happens up here. The universe is a robust thing and can handle that/clean up after it, but the nitpicky privilege-dependent details like entanglement – be it the quantum kind or the more subtle kind tangle channels use – are wiped clean in the process.

And that’s why you can’t jump a tangle channel – meaning, specifically, one end of a tangle channel leaving the other end behind – through a stargate. Once you do, the entanglement is broken and both ends are now just boxes filled with random bits. (Incidentally, this is also why you can’t jump a stargate through a stargate; it scrambles the core’s connection to its counterpart.)

But you can, which has been the point that has led to some confusion, jump both halves of the same tangle channel together, because the topology change then happens around them; they stay inside a self-coherent “bubble” geometry, if you will.

So, for example, when I mention the use of tangle to communicate between IN starships and their AKVs, or tactical sensor platforms, they can get away with that because both ends of the tangle channel jump together; but if they jumped out-system and back in again leaving the platforms behind, they’d lose the communication channel. Likewise, they can’t use tangle comms with pre-placed sensor platforms unless they pick up the other half of the channel after jumping in.

And the chap who stole a colonial tangle-channel and ran off with it to do an NFT scam? He had no problems getting the stolen channel to his target world, because what he stole was both ends neatly packed together in their shipping container.

On the other hand, though, when looking at examples like the tangle channel the Stratarchy of Indirection and Subtlety were using on Vontok II, and so forth, those had to pre-positioned and taken aboard once they got in system. (There are a number of strategies for this, all of them annoyingly complicated and most of them involving some sort of masquerade or other, because they have to delivered STL and even a light-sail starwisp is not what you might call the stealthiest of craft.)

Likewise, when you see starships being ordered to report in over tangle channel, like, say, WHISPER NINE or SHUFFLE FOURTEEN, those tangle channels aren’t carried with the starship, if it’s not a lighthugger. Fleet Communications has carefully and subluminally placed communication relays at lots of different points in the Worlds with onboard channels – some of them in satellites that can receive radio signals, others, more covert, that you actually have to dig up and plug in – and you use them by going to their location, or sending a courier to their location, and then transmitting your message.

Hopefully that should clear everything up!