Whenever I open the new Minecraft Lanucher, it open grey and doesn't display a window title (image attached). Checking the launcher_log, I noticed that it is full with hundreds of the following line.

"[Info: 2021-12-03 15:43:59.5819293: LauncherAppBrowser.cpp(73)] Will launch a Chromium subprocess with command line string: "C:\Program Files\WindowsApps\Microsoft.4297127D64EC6_1.0.104.0_x64__8wekyb3d8bbwe\Minecraft.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --field-trial-handle=2516,11059473021133868296,16348914966762038227,131072 --enable-features=CastMediaRouteProvider --lang=en-US --service-sandbox-type=network --no-sandbox --log-file="C:\Users\USER\AppData\Roaming\.minecraft\launcher_cef_log.txt" --log-severity=info --lang=en-US --launcherui /prefetch:8""

I cannot play Minecraft at all whilst this issue persists. I've done MCL-16409 but it still didn't fix it.