Hi Pandako, the 3D isn't displaying and I'm using AMD as well. I just installed GDevelop fresh on 5.1.156 (see right of image), but it is still the same issue.
In my old project from a few months ago, I can see my camera sprite though as usual, the sky colour is same as the one I set and my events works fine.
Weirdly, playing games made with WithThreeJS works fine on Firefox so I don't know if there is something wrong with how I set up the camera.
I copied the texture URL from Resources panel and pasted it just to be sure, so I'm not sure what texture is "not found".
Thanks for your time!