Hey Cyclopropinon,
I agree it would be nice for NewChunks to save its data instead of having to re-check the chunks every time. It's actually something that I wanted to include when I was making NewChunks. That time it got cut due to time contraints, but I'd like to revisit the idea in a future update.
Having the new/old chunks displayed in Radar is something I hadn't considered before, but I can see how it could be useful. It would provide a whole new way to visualize that data. I do think turning Radar into a full minimap would be a bit too much though.
I have seen the issue with chunks being detected as both new and old before, but so far I haven't been able to figure out what causes it. It's tricky because that bug is so rare and sporadic.
Overall, thanks for all the suggestions! You've given me a lot to think about. While I can't promise immediate development on these ideas, I've definitely noted them down.
Cheers
-Alexander