Trouble generating LODs beyond server view distance

So I have a world that has a lot of pre existing chunks, how do I get DH to actually make LODs without having to physically load all the chunks with the player?
I have the settings
distantGeneratorMode PRE_EXISTING_ONLY
and
enableDistantGeneration true
I have left the radius to the default 256
However, it seems to only be generating LODs within the 16 chunk view distance
Is there another option I'm missing?
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