"failed to load file" when including build script output from cargo workspace root

I am trying to use prost_build to generate rust structs from a .proto file. I've got it working to the point that cargo build succeeds, but rust-analyzer is giving me a "failed to load file .../out/cobalt.event_type.rs" error. I've checked the path in the error and the file does exist and is valid rust code.

In my case, the crate I'm working in is part of a cargo workspace, so the target directory is a sibling of my crate root. It appears from followup comments on #17828 that this might be a bug in rust-analyzer, where it fails to load included source files which are outside of the crate root. That issue was originally regarding non-rust included files, but in this case the included file ends with .rs, so a new issue seemed appropriate.

rust-analyzer version: 1.85.1

rustc version: 1.85.1

editor or extension: emacs-lsp

relevant settings:

code snippet to reproduce:

build.rs:

    println!("cargo:rerun-if-changed=../../libraries/cobalt_protobuf/src");
    prost_build::compile_protos(
        &["../../libraries/cobalt_protobuf/src/event_type.proto"],
        &["../../libraries/cobalt_protobuf/src"],
    )?;

production code:

pub mod cobalt {
    pub mod event_type {
        include!(concat!(env!("OUT_DIR"), "/cobalt.event_type.rs"));
    }
}

Start with the build.rs and production include! snippet, then reproduce the rust-analyzer error in the described Cargo workspace layout. Trace how rust-analyzer handles the generated cobalt.event_type.rs file under OUT_DIR when it is outside the crate root. Done means the existing generated Rust file loads without the reported error.