disclaimer: i am not a mod or an admin so this may be incorrect

The rules thread doesnt say that it isnt allowed as you can verify here: https://forum.craftymynes.com/pages/2-rules

but as @iclutchHD and other admins and mods have said "Any form of cheating will not be tolerated - This means anything that gives you an unfair advantage over players who are playing the game the way the game was intended to be played." and some may look at nonloaded chunks revealing a base an "unfair advantage" against the player who built said base.

so in conclusion it seems like it should be fine based upon what im seeing but i'd suggest waiting on an admin to confirm it.

As far as i'm aware, and assuming i'm understanding correctly, if the game lags by itself and chunks load, you're fine. So long as it isn't actively being created (idk how or even if). That being said, you should not be actively searching out these glitches. If it just happens, that's one thing.