My inventory completely disappears when I die in Survival World in Minecraft Bedrock for Nintendo Switch

Hi there.
Since yesterday I have a problem in a survival world on my Minecraft Bedrock for Nintendo Switch. It's a world I play with my friends, and yesterday while we were completing a Pillagers invasion in our village my friend died in a cave fighting witches and Pillagers, and when he returned to the same place his inventory was missing. It had: sword, pickaxe, armor and trident with enchantments, shield, food, blocks, materials ...
We searched all the caves and all the nearby places and their objects did not appear.
And today, a few hours ago, I was with a friend in the Nether dimension mining quartz to get experience to enchant our armor, and when I enter the portal to return to the village, when the loading screen appears back to the village my character it starts taking damage for no apparent reason, and there was nothing I could do about the loading screen. The immortality totem I was carrying was used up and I ended up dying, when the death loading screen appeared, the loading screen of the journey from the Nether to the Overworld ended and I could see the portal and the village. But when I returned to the place of death, my inventory was not there, nothing, I searched with my friend in the Nether in case the objects had entered the other dimension, I searched for lower layers to the portal in both the Nether and the Overworld, and nothing, my items were: sword, pickaxe, armor, bow, netherite and enchanted ax, torches, materials ... all gone too.
I hope you can tell me what could have happened and if there is any solution please thank you. 🙂