So I was playing on my Switch world just going to the nether to collect resources to build in the otherworld. As I entered the overworld, I started sprinting over to the certain area while jumping as well. As I placed the blocks, they started to disappear as well as the block underneath it. I then realized that it was when I pressed "LZ" the blocks would disappear. I discovered this when I pulled out my sword and pressed LZ. I then did this with my other tools. I encountered this bug a few times but I couldn't figure out for to reproduce it. This was also on a converted world from Legacy with simulation distance at 4 chunks.