devtrackers.gg
Ok, I think I understand now how it work.
When entering a skydome, there is two layers and when you enter through the second one, the skydome must render a snow or a desert landscape.
If the bug occur, everything is upside down, meaning when you go through the second one, it render like you were out.
It can been seen in this precise case when the player is right between the two layers, you can see the desert/snow landscape before you go through the second layer.
Here a screen:
I was thinking of this because before the bug happened, there was a little lag when entering a skydome where you can see outside for just a second then the dome render correctly. After the bug occur, this is the opposite for me, the dome render correctly then the glitch appear.
So I think when a player enter and leave a skydome too fast, the savefile must go corrupt and invert the two layers. I ...
