A more precise exception report about modifying the scene from another thread:

There are others too (e.g. kd-tree) and cells & portals.
Problem is that many culling solutions are ‘conservative’ and not ‘exact’.
To prevent exploits by cheaters, an exact culling technique is needed.

I think the question of methusalah was more in the direction:
“Why do scene culling on server and not on clients?”

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