Map bug on the Itza Party route - you can see the KMs up the top as I started the route from 0km.
Please can you explain in words what the problem is?
From the screenshots, you can see how the surrounding turned black. Somehow it seems the bike went underground, possibly something to do with the elevation model. I was doing a ZA workout number 4, not sure if that’s relevant. The screenshots show the KMs on the route where the background basically was black. A faint shadow of the bike could occasionally be seen. That is why I think there was something wrong with (potentially) the elevation.
I’m on PC version.
Is workout pain effect enabled in your in-game settings? That pesky setting causes lots of problems. If it is, disable it. 
I think this must be unique to your individual ride, else thousands of people would have reported it if it was a universal, map-level bug.
Hope this helps.
Will try that, thank you.
Update - pain effect is not enabled.
Can you share some information about the PC hardware? Posting screenshots of the system and display tabs seen in dxdiag.exe would help. Most importantly which GPU and video driver version are in use.
DxDiag is here.
Actually it is definitely something related to my setting as I have found the same issue on other routes too.
Some more videos and screenshots are on my activities:
The at Home Cycling & Running Virtual Training App
The at Home Cycling & Running Virtual Training App
Any clues are appreciated.
It looks like your laptop has both Intel Iris Xe graphics, and Nvidia MX450 graphics. I don’t know which one is being used by Zwift.
The Intel integrated graphics frequently cause problems with Zwift that are resolved by using the driver downloaded directly from Intel. You are not running the latest driver which you can get here:
https://www.intel.com/content/www/us/en/download/785597/intel-arc-iris-xe-graphics-windows.html
The Nvidia MX450 driver also appears to be out of date. I have no experience with that GPU so I don’t know if it matters. With most Nvidia GPUs, Zwift works fine using whatever driver Microsoft delivers as latest. If you install the driver from Nvidia, you do not need to install the optional “GeForce Experience” software.
If you want to try forcing Windows to choose one GPU or another for Zwift, you can do that in Windows settings. That might be a useful thing to test since you have two options.
Thank you. I’ll try all these and report back.
By the way if you want to know which GPU was in use the last time you ran Zwift and saw this buggy behavior you can upload a Zwift log file (in Documents\Zwift\Logs) to zwiftalizer.com and it will tell you that, as well as how it performed. You could use that to understand the performance and Zwift graphics profile differences between the two GPUs by uploading logs after running it on each GPU, if you care about that sort of thing.