Quest 3S: XR_EXT_user_presence Extension Issue with HMD Removal

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Created 11 days ago

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Inputs

Investigation summary

The Quest 3S standalone device reports support for the XR_EXT_user_presence extension but fails to deliver a negative event (XrEventDataUserPresenceChangedEXT with isUserPresent=XR_FALSE) when the HMD is removed. Specifically, when the headset is removed for 5-15 seconds, no raw false event, Unity Input System edge transition, or HMDUnmounted callback is triggered. The session remains focused, and upon remounting, the first visible content is VR without a false->true event pair. Positional tracking loss is correctly detected via OVRPlugin.positionTracked and OVRManager.TrackingLost. This issue occurs with the following configuration: Quest 3S (panther), Horizon OS build 3697600027800610, Android 14/API 34, Unity 6000.0.60f1, com.unity.xr.openxr 1.16.1, com.unity.xr.meta-openxr 2.4.0, and com.meta.xr.sdk.core 78.0.0.