Hello,
Just want to add my two cents on this issue:
First all, apologies, as I do not use the MG HS PHEV, I live in a country where the only electrical model was the ZS, my HS 2022 is petrol.
Second, I have exactly the same issue as you guys, the local MG agency says that they do not have an update on the infotainment software. So I registered on the Waze beta software forums, it seems that the issue affects a lot of cars of other brands.
I know this is a bit tedious, but I strongly encourage the affected owners to make a Waze beta account on their forums and upvote the issue, so that Waze staff starts fixing this issue soon. As others have said, this issue only affects Waze, as using Google Maps or any other NAV software, works well.
Here's that thread:
BUG-11776