Compatibility: Avoid converting to compressed formats when retrieving image data #100778
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The Compatibility renderer (GLES with Texture2D or GLES/OpenGL with TextureLayered) attempts to convert the temporary framebuffer-rendered textures retrieved from the GPU from RGBA8 into their original formats, even if they are compressed. This causes errors to appear randomly when generating thumbnails, for example.
This PR disallows that behavior, although a better solution would likely be to improve the texture reading logic