Animation overrides that spawn items or particles in VR will bug out and loop infinitely if you use the gesture as you sit down on a chair or other surface. You can use other gestures to spawn other things during this bug, but the objects that are stuck will not disappear. The only way to despawn the object or particles is to change avatars. This is especially annoying if you have an override mapped to [Finger Point] or [Fist]. I don't know if this is an issue with all VR sets, but I'm experiencing this issue with a Vive.