At first the game works great. Taking the boat across the sea the chunks loaded slowly but OK. Then in the canyon in the mine shaft and everything that is collected and dismantled. Shortly before leaving the 1 bug occurred. Nothing could be seen looking out of the shaft as the adjacent chunk was not loaded. Going back into the shaft and back to the spot where the adjacent chunk wasn't loading - a presumably half-loaded chunk with observer mode was now visible. I went back through the mineshaft and to the boat I wanted to take home. After a few hundred blocks, the chunks stopped loading and froze. Wanted to go back to the canyon but the chunks wouldn't load there either. So I wanted to save because I couldn't go anywhere - but that didn't work. The save process was also frozen. After 1 hour was still not saved. So just quit minecraft and everything was gone.