You’re causing thousands of block updated that way, because when you change one of the blocks; the neighboring faces will change to pores, and then it does it again for it’s neighbors, and again, and again until either all loaded chunks finally changed, or the game runs out of memory.
You’re causing thousands of block updated that way, because when you change one of the blocks; the neighboring faces will change to pores, and then it does it again for it’s neighbors, and again, and again until either all loaded chunks finally changed, or the game runs out of memory.