When playing offline as a secondary player in a split screen format your skin, last location, and any items you had on you will be forgotten should you exit the game and come back later. However, logging out and back in will sometimes bring some of these back but not always.
The same goes for playing online in realms. Although it is mostly the skin that is forgotten in this instance.
This issue has been occurring since at least 2017, as indicated here: https://bugs.mojang.com/browse/MCPE-26498
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We're resolving and linking this ticket forward as a duplicate of MCPE-55815, as that ticket contains more detailed information and/or has already been triaged by Mojang.
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This happened to me on XBOX one S. It was just a small bug before 1.16.210, but then it became a major issue after the update. Before, restarting Minecraft would fix the issue, but now the 2nd player on split screen has lost all progress permanently. I have lost all my netherite tools and armor because of this bug. I know that my progress was reset and I did not just die, because if I open my ender chest, nothing is there! Please, Mojang, fix this bug. 😞