Im thinking so, I noticed it by accident when I was trying to build a house of obsidian and messed up so I enabled smart cursor to clear up and the whole mess exploded, must have been the same issue with my first plot of lava, obsidian broke like the water was destroying it, kinda like when it flows over torches and such. I cheated in some new lava because it would take too long to start over, or since im in expert mode go to hell and farm lava slimes, which is even harder cause I have Thorium enabled so there's even more mean things to kill me in most biomes. I've since setup a honey and obsidian generator, getting realy bored though, is there a recipe for wire? Cause I don't wanna wait till I can kill skeletron just to setup the automation, I kinda need the automation to get in position to fight skeletron really.
Also I've noticed the spawn rate is abysmal even if you build a bridge out in either direction, the spawn rate cranks up when I get near the dungeon or temple though. If at all possible could you tweak the enemy spawn rate so its less reliant on large numbers of blocks on screen, I'm assuming thats the issue since nearly nothing spawns far from the dungeon or temple even during bloodmoons.
One last thing, I kind of find the starting island to be a bit spartan, even for a skyblock, would you mind if I edit them a little and upload them. I'm thinking of adding some clouds to make it look a little more in theme to terraria, add some logic to the being in the middle of nowhere. Maybe make the starting water and lava sources a bit bigger and maybe with signs to explain how to dupe the liquids so people don't accidentally make the same beginners mistake I made, heh. I was also thinking some smaller islands could be hidden around with different biomes on them, like a jungle island near the temple, since I honestly don't get how you're supposed to get mud otherwise, I haven't gotten any jungle seeds from dirt so I assume the only way is the usual break jungle grass, which would take forever with only 2 blocks of jungle grass. Either that or return the mud recipe to vanilla so it can be manually expanded without having to expand it to make mud in the first place.
tl;dr
1) I think I must have been using smart cursor mode
2)Need moar wire pre-skeletron
4)Need moar enemies, (and fishing bait) spawning
5)I'd like to make a friendlier, prettier, less grindy map.