I am playing on the newest snapshot, and keep finding bad generated things (in the nether) like flat generated terrain and right now a nether fortress. I were looking for a fortress a very long time. but today I decided to ride a strider and try to find one. after a couple minutes, I finally found a pillar from a brigde from a fortress. I thought that finally I could beat the game after a half year of playing on my world. I stacked up to the bridge, and suddenly I realized the fortress was only one chunk, did not have a blaze spawner and The game did not even count that as a fortress, because of I did not even get that advancement what says a terrible fortress. I hope you will fix this problem about the generating structures and terrain soon. Im not sure if you will care, but I do this so Minecraft will be better and released without bugs,  not because I want to show how bad this is. I love Minecraft and that's why I ask to fix this thing.