After restarting Minecraft Bedrock Edition, the custom skin set on the last launch automatically changed from a slender model to a wide model

After launching Minecraft Bedrock Edition, I set up a custom skin for a slim model.

But if I close Minecraft Bedrock Edition and launch the game again, the custom skin I set up changed from a slim model to a wide model.

In addition, this issue is only present when setting custom skins, and if you use skins in the store, then this will not be affected by this bug.

(Machine translation was used for this question)