Multiple glitches where chests disappear and out of chunks part do not save

Phone: Redmi Note 4

THIS BUG NEEDS TO BE FIXED!!
So, the other day, I was playing survival... I played for some time, and then I left the world. When I came back, everything was fine, just the way I had left it. Then I came back. I played for many hours...I expanded, decorated my cave house and farm, and I found 2 villages and 2 desert temples, from which I got this AWESOME loot. Then I came back to my cave house, and I tried to exit my world, but then my game crashed. Next morning I went in the world to play, and found that everything I had done the day before had not been saved. This especially angered me even more, because I hadn't slept that night as was playing on that world. And even more, I had taken so many risks on the journey to the village and back. So, anyways, when I started playing again, I thought "Never mind, it's gonna be okay, I'll take a trip to the village and back again, and I will bring the useful resources with me, so I won't risk much."
So, before I went to the village, I redecorated my cave house and farm, and took lots of food from my chest, and I took the bed from where it was before. So, I went to the villages and temples again, BUT THERE WERE NO CHESTS. I tried tapping on the area where the chests were, because I thought they might have not rendered, but THEY WERE NOT THERE. So my journey was a complete fail. So, after many days, I reached back home, to my unbelieving, MY CAVE HOUSE AND FARM WAS BACK TO HOW IT WAS BEFORE I LEFT. But, but but but but, my bed was back where it was, and the items I took from the chests were back there, but when I opened my inventory, the bed I picked up was still there, the items I took from my chests were still there... So, the duplication didn't anger me or anything, BUT I DECORATED MY HOUSE AND FARM TWICE, AND THE CHESTS HAVE NOW DISAPPEARED FROM BOTH THE TEMPLES AND VILLAGES!! PLEASE FIX THIS