Many 4K USB-C touch screens use 4-Lane DP mode instead of the 2-Lane DP mode, for a USB-C cable made of copper this is not a problem but for a AOC cable it is a problem because there is a conversion taking place in the cable from an electrical signal to a light signal and this has to be converted again at the other end.
Below is an image of the pin use of a 2-Lane USB-C cable (AK4310).
In this cable, 4 wires/pins are used for Video (Purple) and 4 wires/pins are used for Data (Orange).
So here you have 1 chip that converts data (orange) into a light signal and on the other side this is converted back into an electrical data signal. And the same goes for the video signal (purple).
When connecting a monitor using the 4-Lane DP technique, the 4 wires for Data are used for video as you can see in the picture below.
The Chip must then be able to deal with this to detect that no data but a video signal is being sent, this is not possible with the chip that is in the 2-Lane AOC cables. In the AK4335 there is an additional chip that determines the use of the cable, does it need 4 or 2-lanes for Video. When it needs 4-lanes it switches to a Chip using all 8 wires/pins for video signalling and for the touchscreen the USB 2.0 data (Green) is sufficient for the touchpanel to work. If it detects a display with USB-C and 2-lane is sufficient it will only use 4 pins for video keeping the other 4 pins for data transmission up to 10Gbps.
Additionally the AK4310 is only 10m the AK4335 has a length of 15m (but with a limitation of only 40W PD instead of 60W)
So since most 4K touchpanels need 4-lane for the video signal you will need an AOC cable that can do this: AK4323 (3m, 60W); AK4325 (5m, 60W); AK4327 (7.5m, 60W); AK4330 (10m, 60W); AK4335 (15m, 40W)