Lints from any project are used in all projects in multi-project workspace

When working in a workspace, lints enabled in one subproject get applied in all projects, even if they themselves do not enable the lints.

Reproduce

Workspace structure:

Root
+--- homelander/
+--- TestModule/
+--- Cargo.toml

Workspace Cargo.toml:

[workspace]
members = [
    "homelander",
    "TestModule"
]

Lint in test_module:

#![warn(clippy::cargo)]

No lints are specified in test_module.

When running cargo clippy from the root of the workspace, the bug occurs.

I expected to see this happen

Clippy does not apply lints in one project to all projects in a workspace

Instead, this happened:

Clippy applies lints enabled in one project to all projects

warning: package `test_module` is missing `package.description` metadata
  |
note: the lint level is defined here
 --> homelander/src/main.rs:7:9
  |
7 | #![warn(clippy::cargo)]
  |         ^^^^^^^^^^^^^
  = note: `#[warn(clippy::cargo_common_metadata)]` implied by `#[warn(clippy::cargo)]`
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata

warning: package `test_module` is missing `either package.license or package.license_file` metadata

Meta

• cargo clippy -V: clippy 0.1.52 (9bc8c42 2021-05-09)
• rustc -Vv:

rustc 1.52.1 (9bc8c42bb 2021-05-09)
binary: rustc
commit-hash: 9bc8c42bb2f19e745a63f3445f1ac248fb015e53
commit-date: 2021-05-09
host: x86_64-unknown-linux-gnu
release: 1.52.1
LLVM version: 12.0.0

Start with the workspace Cargo.toml and the cargo clippy invocation, then trace how the lint attribute in homelander/src/main.rs is applied across workspace members. Reproduce the reported warnings and verify that each project only receives lints enabled for that project.