Custom camera recording or streaming solutions, either avatar or world, were able to render directly to desktop with minimal performance overhead and native resolution by enabling unity camera with "Target Eye" set to "None (Main display)".
Since the quickmenu render update, now having such camera completely breaks both vr and desktop views, just like in this canny(but not temporarily): https://vrchat.canny.io/open-beta/p/1155-screen-capture-distorts-your-view-in-vr-for-a-few-frames