I use this extension cable with Cable Matters USB-C multiport adapter (https://www.amazon.com/gp/product/B06Y5N3YCD/) 4k- Display, USB, Ethernet and power for my 2017 Macbook Pro. It doesn't charge from the USB-C port on the top left, but that's likely a defect in the laptop. It works reliably and offers fast charging via the port on the bottom left.
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