This is clearly not an isolated issue affecting just one person. Unless all those other people making posts about it here and in the reddit post I linked earlier have “something going on with their setup”
There seems to be an issue with the dirt road between Neokyo and Yumezi. Which just so happens to be the location where Urukazi joins the map and this problem only seems to have started since the last update. Coincidence? Or Zwift bug?