This is the one I use. I've had it for 2 years and it works as expected with Fast Charge.

https://www.amazon.com/gp/product/B07FJNH8P6/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&psc=1

I bought this, it comes with 2 pretty long cables and they work with Warp charging when plugged into the usb brick that came with the phone.

Got this one, long cable and works with Dash!

Dash Charger Cable, TITACUTE for OnePlus 6 Charging Cable 2 Pack Durable Nylon Braided Fast Charge Type-C Cable 6.6FT Data Sync Charging Rapidly for OnePlus 6T 5 3T Warp Charge for OnePlus 7 Pro Red https://www.amazon.com/dp/B07FJNH8P6/ref=cm_sw_r_sms_apa_i_zMzBEbFCS8Z8X