I'm getting this exact same problem, but I'm having an issue with sand. The symptoms are the exact same thing.
I used the farlands mod to generate the terrain it happened in, but I didn't see the class file it modified in the stack trace. I then loaded the world in unmodded vanilla minecraft and got the same result. It was a custom world generated with a custom worldgen, but the world still crashed when loaded without the mods.
EDIT: So in plain vanilla minecraft, used -Xss8M to increase the stack size, then I teleported to one of the sand blocks in question. I saw a floating cactus in the air a couple blocks from the line of crashing sand blocks. It seemed odd to have a cactus floating in midair, and I wonder if that may have anything to do with it.
Anthony Presley
I'm getting this exact same problem, but I'm having an issue with sand. The symptoms are the exact same thing.
I used the farlands mod to generate the terrain it happened in, but I didn't see the class file it modified in the stack trace. I then loaded the world in unmodded vanilla minecraft and got the same result. It was a custom world generated with a custom worldgen, but the world still crashed when loaded without the mods.
EDIT: So in plain vanilla minecraft, used -Xss8M to increase the stack size, then I teleported to one of the sand blocks in question. I saw a floating cactus in the air a couple blocks from the line of crashing sand blocks. It seemed odd to have a cactus floating in midair, and I wonder if that may have anything to do with it.