Skin changes when opening Minecraft

Minecraft Bedrock Edition for me has a WEIRD issue with skins. I use an unoffical skin, and when I open it again my skin changes to Alex for no reason.

Steps to reproduce the issue

1. Set your skin to an unoffical one

2. Close Minecraft

3. Open it again

4. The skin will dissaper, and will get replaced by Alex (in my case)

How to fix that:

I don’t really know how to fix that. Maybe it will be this:

1. When you turn off Minecraft, the skin has to be saved to the Microsoft account

2. And when Minecraft gets open, it has to read data from the Microsoft account, and show up the skin that you use.

Expected result:

When opening Minecraft, the skin stays the same if it din’t got changed by a player

Actual result:

When opening Minecraft, the skin changes to Alex (in my case) and you need to change it manually