Thanks @Leonidas
Your solution solved a problem
But the border are still white (they’re displayed correctly in the editor)
Maybe not clear in this picture but in the gameplay it’s a sharp white
Ah that’s a resolution / resizing issue with filtering.
I remember that happening between editor/launch views, one way to improve that usually is to resize your graphics to be closer to the resolution they appear in game.
Here is a similar post on the topic which provides a number of ways to work around that: