Running tests with Nightly and Coverage can cause "duplicate export name"

[kh-aeros]

🐛 Bug description

When running wasm-pack with experimental WASM code coverage in release mode, the tests fail to run. The browser outputs the following:

Uncaught (in promise) CompileError: WebAssembly.instantiateStreaming(): Duplicate export name 'closure541_externref_shim' for function 2118 and function 2119 @+11708

This does not occur in Debug, so I'm assuming it's one of the optimisations that are occurring. I assume wasm-opt isn't being run by wasm-pack test, even though it builds the application too, as running wasm-pack build explicitly states that it does (and has the --no-opt switch).

There are no explicitly set release flags.

I noted that the docs say that wasm-opt is enabled by default in the release profile, but I added the following to my Cargo.toml, and the output binary was no different.

# `wasm-opt` is on by default in for the release profile, but it can be
# disabled by setting it to `false`
[package.metadata.wasm-pack.profile.release]
wasm-opt = false

🤔 Expected Behavior

WASM should not duplicate export names, and tests run successfully.

👟 Steps to reproduce

Command being run:
RUSTFLAGS='-Cinstrument-coverage -Zno-profiler-runtime --emit=llvm-ir --cfg=wasm_bindgen_unstable_test_coverage' wasm-pack test --release --chrome

🌍 Your environment

Include the relevant details of your environment.
wasm-bindgen-test version: 0.3.42
wasm-pack version: 0.13.1 (as installed by wasm-bindgen-test)
rustc version: nightly-2025-01-06-x86_64-unknown-linux-gnu