I have not noticed such an occurance while running .61 tekkitlite server. As far as I can tell, any volcanos/trees I come across from normal exploration with my client while running tekkitlite appear to properly assemble themselves, even if they spread across 200 blocks.
I was playing with the minecraft bot mineflayer(https://npmjs.org/package/mineflayer), but even after modifying the current source to pretend to be a 1.4.7 client, I ran into the issue of not being able to pretend to be a forge client. I am not that great at javascript.