Uniform buffer in vertex shader "disappears" when adding uniforms to fragment shader

I'm currently trying to "port" [glium's incomplete tutorial](https://github.com/glium/glium/blob/master/book/SUMMARY.md) to rendy by looking at rendy's examples and API docs. I've unfortunately hit a roadblock on [part 6 "Uploading a texture"](https://github.com/glium/glium/blob/master/book/tuto-06-texture.md). The uniform buffer I was already using successfully "dissapears" when I add `uniform texture2D` and `uniform sampler colorsampler` to the fragment shader. `ShaderReflection.layout().unwrap()` returns
```Rust
Layout {
sets: [
SetLayout {
bindings: [
DescriptorSetLayoutBinding {
binding: 1,
ty: SampledImage,
count: 1,
stage_flags: FRAGMENT,
immutable_samplers: false,
},
DescriptorSetLayoutBinding {
binding: 2,
ty: Sampler,
count: 1,
stage_flags: FRAGMENT,
immutable_samplers: false,
},
],
},
],
push_constants: [],
}
```
even though I haven't removed the uniform buffer that on its own is detected as
```Rust
Layout {
sets: [
SetLayout {
bindings: [
DescriptorSetLayoutBinding {
binding: 0,
ty: UniformBuffer,
count: 1,
stage_flags: VERTEX,
immutable_samplers: false,
},
],
},
],
push_constants: [],
}
```
It doesn't work properly when I set the descriptor layout manually either.
The relevant code can be found [here](https://github.com/maroider/glium_tutorial_but_its_rendy/blob/b55aa5fac7ac7957b7855e14cae133e9631e3e00/src/bin/06.rs) along with the [vertex](https://github.com/maroider/glium_tutorial_but_its_rendy/blob/b55aa5fac7ac7957b7855e14cae133e9631e3e00/src/bin/06.shader.vert) and [fragment](https://github.com/maroider/glium_tutorial_but_its_rendy/blob/b55aa5fac7ac7957b7855e14cae133e9631e3e00/src/bin/06.shader.frag) shaders. The bits that make it break in various ways are commented out.