Certain types not found with a custom rust-project.json (e.g. AtomicU32)

So, I'm developing on a project using meson to compile rust source files and so it does generate a rust-project.json file that works quite nicely. However certain types aren't detected in the code autocompletion, like AtomicU32, however AtomicBool and AtomicPtr are.

I was wondering if something special needs to be done to the rust-project.json to make those appear as well, maybe certain implicit cfgs aren't detected? It's not quite clear from the documentation if anything needs to be done there to make this work.

rust-analyzer.linkedProjects points to the generated rust-project.json file.

{
    "sysroot": "/home/kherbst/.rustup/toolchains/1.82-x86_64-unknown-linux-gnu",
    "sysroot_src": "/home/kherbst/.rustup/toolchains/1.82-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/",
    "crates": [
        ...
    ]
}

rust-analyzer version: rust-analyzer version: 1.89.0 (2948388 2025-08-04) [/home/kherbst/.cargo/bin/rust-analyzer]

rustc version: rustc 1.82.0 (f6e511eec 2024-10-15), but same issue with stable

editor or extension: VSCode

Start with the generated rust-project.json and the rust-analyzer.linkedProjects configuration, comparing the available cfg information for AtomicU32 with AtomicBool and AtomicPtr. Trace how rust-analyzer reads the linked project and sysroot; done when AtomicU32 is available in code completion for this setup.