My items removed from my inventory

Coordinates : 278 80 -238 xyz
Seed: 2755622338800910064

I was playing at Bedrock 26.33 version, I was digging down in 2 by 1 blocks area. Then, I found an underground lake. While I was exploring the lake some of my items including a pickaxe are dropped from my inventory and they disappeared

I only heard items dropping my inventory

I was holding another item

I didn’t dropped them they dissapeared at the lake in the seed 2755622338800910064 and the coordinates are 278 80 -238 xyz