The "unused manifest key" warning doesn't print or halt the publishing with `cargo publish`

Normally if you have a manifest key that cargo doesn't understand many of the commands will print a warning

D:\dev\cargo-gba>cargo build
warning: unused manifest key: package.repsitory

However, if you use cargo publish not only does the accidental key not halt the publishing process without an override flag (as one might expect, similar to how you can't publish with a dirty git state without a flag), but it doesn't even directly print the warning about a bad key. Instead I got the warning about "no documentation, homepage or repository."

D:\dev\cargo-gba>cargo publish
    Updating crates.io index
warning: manifest has no documentation, homepage or repository.
See https://doc.rust-lang.org/cargo/reference/manifest.html#package-metadata for more info.

(Was posted as https://github.com/rust-lang/rust/issues/64476 and then I was told to repost here because apparently there's a gap in the permissions among triage folks, which has already also been reported elsewhere so we can have that solved too soon enough)

Reproduce the issue with a manifest containing an unused key, then compare the output and publishing behavior of cargo build and cargo publish. Trace the publish command's manifest validation and warning handling. Done means cargo publish reports the unused key clearly and applies the intended publishing validation behavior.