Coverage unreported when using `--doc` in multi-member workspaces

[wiktor-k]

Hi,

Thanks for cargo-llvm-cov this is a really great project I'm using every day! 🙇

I've noticed one issue today. When running just the doc tests in a workspace project (e.g. via cargo +nightly llvm-cov --workspace --doc --locked --text) the coverage results only cover one of the members (probably the last?) even though the tests ran for all of them (as evidenced by the console output).

Furthermore when changing --doc to --doctests I see the other one in the report too but it's wrongly marked as uncovered.

(I want to run --doc for doctests and nextest for other tests so I'd rather avoid using --doctests).

I've made a small reproducer project with exact console output here: https://github.com/wiktor-k/llvm-cov-test

> rustc --version
rustc 1.90.0-nightly (b03b3a7ec 2025-06-26)
> cargo llvm-cov --version
cargo-llvm-cov 0.6.14

I've search existing issues and didn't find anything and I wonder if this is a known issue or is there any kind of a workaround?

Thanks for your time! 👋