Usb-c to HDMI charge issue

When I connect laptop to tv via usb-c to HDMI cable laptop stops charging through original charger, even if red led is working. When I connect laptop via mini HDMI, everything works well.

Seems to be a consistent problem with the USB-C. I have exactly the same issue when I plug in a USB-C to RJ-45 LAN adapter, so bought another that uses the standard USB connector and battery charges correctly.