Skin keeps getting changed back to a certain skin everytime I open Minecraft

I recently signed up for the Minecraft Earth Beta and redeemed my skin. I applied it, switched back to my custom skin, then left the game (closed Minecraft). I re-opened Minecraft and the Minecraft Earth skin was applied. I re-applied my custom skin, closed Minecraft, re-opened Minecraft, and it was still applied. I have to change it now every time I open Minecraft.

What I expected was: I open Minecraft and my custom skin would still be applied by default.

What happened was: The Minecraft Earth skin keeps getting reapplied every time I open Minecraft.

Steps to reproduce: Get the Minecraft Earth skin, apply it, apply a custom skin, then close Minecraft and re-open it.