Oneplus 8T charging with older charger and cable

I just bought a new phone (OnePlus 8T) that supports fast charging. If I use the cable and charger provided, it’s charging super fast – averaging 2000mA according to Ampere app.
But if I use the old cable and charger that I’ve been using to charge my old phone, it’s averaging <500mA, even though the exact same cable and charger would average 1000mA or more for my old phone.
How does that make sense?

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