Yeah, something's not right with your scene graph. You shouldn't see that behavior if your PagedLODs are structured correctly.
You might add some debugging messages to determine what is happening in the PagedLOD node that contains the geometry that disappears in #2, as it must be switching to SOME other child during the #2 time period. You're not using an extra level of indirection like a second PagedLOD under the main PagedLOD, are you? Or a Switch or a ProxyNode or something else? What built the quadtree database?
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