inventory disappearing when loading into world after knowingly saving ggear an tools into primary chest

when I was ready to get off and go to bed I SAVED AND QUIT my world. I just tried to load my world , the same world that I SAVED AND QUIT the night before,and my whole inventory was wiped clean! I had absolutely nothing in my inventory when I KNOW FOR A FACT my inventory was completely full of my most important tools, weapons and I was wearing my best armor! everything was enchanted with the highest and best enchants on every item that I had. everything was either diamond or netherite rarity... this is the second time this has happened! the first time I didn't have too many important items in my inventory to really get upset over. but this time was not. I'm very upset that I lost the most important items that took me a long time and a lot of hard work to get.