Entity culling unreliable when map has portal effects (flickering items and players)

An easy way to visibly reproduce is to stand in the corner with the shards across from the MH on stormkeep, and look at the crylink through the warpzone. The crylink flickers constantly, as does a player standing at that position.

There are many places on stormkeep where the incoming netgraph will show update spam, especially in the hagar room, and this is exacerbated by sv_cullentities_trace_eyejitter 16 (dp default). sv_cullentities_stats 1 reveals that PVS is indecisive about culling some items, and some of them will intermittently get culled by trace when not culled by PVS.

sv_cullentities_trace 0 does not help but sv_cullentities_pvs 0 does stop the flickering and update spam.