Not an issue, I just want to point to this related project I wrote ages ago.
It had a server component to sync chunks between players, so you can see ahead into areas you haven't explored yet.
It also only stored the exposed chunk sections to not illegally download hidden underground structures (it was being used on a server where secrecy matters and rules disallowed that) and also maybe save on performance.

https://github.com/Gjum/morechunks-forge
https://github.com/Gjum/morechunks-server

Glad to see an updated mod with basically the same features, love your work.