Question about pregen

Hello everyone, just want to make sure. I tried to find the answer on Discord but didn't come across any clear explanations.

So, I had a world already generated by players (not up to a specific radius, but there is a border), and I installed DH on both the server and client. The generation mode is set to PRE-EXISTING.

Will DH automatically generate all LODs for existing chunks when I start the server (assuming no one is online), or will I need to run the /pregen command? Because when I execute the command and set an arbitrary radius larger than the world border, it seems to take some time to process chunks that shouldn't need to be generated.
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