`cargo package` and `cargo publish` cannot serialise Cargo.toml

Problem

Running cargo package or cargo publish yields an error, despite cargo build and cargo run working successfully.

error: failed to prepare local package for uploading

Caused by:
  values must be emitted before tables

Steps

1. Clone the project I'm trying to publish
2. Run cargo package or cargo publish on the project

Notes

Output of cargo version:
cargo 1.56.0-nightly (b51439fd8 2021-08-09)

Platform:
aarch64-apple-darwin, MacBook Air (M1, 2020), macOS Monterey (12.0 beta 5; 21A5304g)

[ehuss]

Thanks for the report! I have posted a fix at #9789.