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Speaking of passing through PD communications, I have a cheap Chinese power meter that sort of does that but not properly. Hopefully, OP has a good hub that plays nice.
If you use a setup with a power supply, first cable, power meter, and a second cable, you can measure things when connected to a chargeable device like a laptop. It obviously tells the PS to give it 12 V, which it will. Once you unplug the laptop from the second cable, the voltage reading doesn’t drop back to 5 V. Apparently, the power meter doesn’t let the PS know there’s no load anymore.
As a result, you get a USB-C cable that gives you 12 V without asking any questions. Guess what happens when you plug in something that can only handle 5 V? Bad things. Don’t ask me how I know.
Anyway, once you unplug the power meter from the first cable, the PS finally gets the message and drops the voltage back to 5 V. Makes me wonder if a hub could behave the same way as my power meter.