I did that (put it into a bucket, and then put it into a chest, and it doesn’t disappear) again, and when I pour the sulfur cube out, It becomes a normal big one, and it doesn’t become small. So that means it “grows up”. How strange!
Sometimes, I try to put it into a bucket, and then put it into a chest, and it doesn’t disappear. But I only do it successfully in creative mode, and it doesn’t work every time. I don’t know why.
I did that (put it into a bucket, and then put it into a chest, and it doesn’t disappear) again, and when I pour the sulfur cube out, It becomes a normal big one, and it doesn’t become small. So that means it “grows up”. How strange!