These features and enhancements will become available starting the week of April 19th, 2021.
Ya I had a very similar issue with v28, v29 except my visual artifact had a red tint instead of being white/bleached out.
Here's the image posted in the thread you linked: large (749×999) (oculusvr.com)
I was able to fix it by disabling Link settings in OTT, and setting ODT settings to default. For some reason, after the reset I can now change Link values back to custom settings via ODT (OTT Link still disabled) and the visual artifacts haven't returned.
Got the Desktop-App v30 in the release-channel yesterday... no words on changes / release-notes.
Also not on the official site: Oculus - Release-Notes - latest ist v29 back to may.
Works with firmware v29 on Quest 2... Air Link has to be activated in beta-section as before.
One new option (also in beta-section of the app) : OpenXR - runtime.
(wich should reset OpenXR back to Oculus if that changed in multi HMD environments)