Textures in rgb8 format become rgba8 in rendering

[Redwarx008]

Godot version

4.02

System information

Win10 Vulkan/GLES3 Intel(R) UHD Graphics 750

Issue description

Textures in rgb8 format become rgba8 in rendering.
After debugging, I found that the format of texture is still rgb8, but the format of texture->rd_texture has changed to rgba8. I don’t know if it is intentional.

Steps to reproduce

Create a texture in rgb8 format, and then use renderdoc to grab a frame to view.

Minimal reproduction project

[Calinou]

• Related to VRAM texture compression always uses DXT5 codec #58012.

Can you test the latest master branch? This was likely resolved by #76516 for VRAM-compressed textures.

#56523 remains an issue, but only for L8/LA8 formats.