I got my new cable from HP and it seems to work well in DCS now, haven’t tried MSFS yet. I’m in the UK and was told by a very rude HP employee who kept arguing and interrupting me that a new revision cable wasn’t needed and that he would escalate to a level 2 engineer, he also said they were out of stock in any case and that I would be waiting a long time to receive one. Funny thing is I got a dispatch notification later that evening and it arrived from Europe next day!
If your audio cuts out/screen goes blank then contact HP and don’t accept anything other than a revision 2 cable.
I note that even with the new cable I can’t use a USB-C port directly on my X570, only using a dongle works.