Nvidia Quadro RTX 6000, color space grey out with RGB setting


I have an Nvidia Quadro RTX 6000 running on ubuntu. I would like to change the Color Space setting from RGB to YCrCb but it does not allow me as shown in the picture: image.

The card is running drivers 460.91.03.

Another interesting point is that we are converting from Display port->HDMI->SDI. I found another forum discussing about this topic with another video card Quadro P2000 back on 2018

The outcome was to change the DP->HDMI converter to a passive DP->HDMI converter

Is this something expected?

if that is the case what type of characteristics does the DP-HDMI converter has to have in order to allow changing the color space?