After #617 fixed connection detection, the XR session goes active and hydrabody runs steam -applaunch 323910 to launch the experience, but the SteamVR Performance Test never starts (no vr.exe process, no Steam launch log) - reproduced even running the applaunch manually on chunky (only a Steam helper BrHostSvr appears). The app is fully installed (appmanifest StateFlags 4) and owned. User stays in SteamVR Home (night sky), stream renders fine, but the app never presents. Likely a Steam/appid launch quirk specific to this benchmark tool. Matters for the visitor bring-your-own-library flow (#560). Our own UE experiences (GRM) launch via exe_path directly, not applaunch, so are unaffected. Investigate: correct launch method for 323910, or use vrmonitor/SteamVR app-launch API instead of steam -applaunch.