npx wrangler dev fails off a fresh project generated with cargo generate cloudflare/workers-rs and leptos template

Steps to arrive at this problem

cargo generate cloudflare/workers-rs
..
template -> leptos
nightly features -> false
windows syntax-> false
...

npx wranger dev

...
A bunch of rust-lld errors such as
= note: rust-lld: error: duplicate symbol: __wbg_intounderlyingbytesource_free

rustc 1.97.0 (2d8144b78 2026-07-07)
cargo 1.97.0 (c980f4866 2026-06-30)

One suspect I have is that Cargo.lock has two wasm-streams versions.

% grep "wasm-streams " Cargo.lock
"wasm-streams 0.5.0",
"wasm-streams 0.6.0",

One workaround is to downgrade worker to 0.7

[build]
command = "cargo leptos build --release && cargo install -q \"worker-build@^0.7\" ...

Reproduce the failure from a fresh workers-rs project using the cargo generate leptos template, then run npx wrangler dev and inspect the duplicate rust-lld symbols. Compare the two wasm-streams entries in Cargo.lock and the worker 0.7 workaround; done means the generated project builds and starts without duplicate-symbol errors using the current setup.

Written by the indexing model from the issue text.