Exporting to WebP does not automatically flatten images with multiple layers
Much like the title suggests, exporting images to WebP does not flatten the layers as it does when exporting to other formats such as png or jpeg. Instead, it only exports the currently selected layer.
This is my XCF: phone_bg_v2_resized.xcf It has two layers: the girl and the gradient background layer.
This is what I get when I export to WebP while unknowingly having the bg layer selected: phone_bg_v2.webp
Interestingly enough, when exporting an image with multiple layers to WebP, it gives me the option of making an animation: screenshot-2018-07-05T02_06
My operating system is Arch Linux, and my version of GIMP as reported from pacman is 2.10.2-3. Let me know if you need more information.