unknown import: `__wbindgen_placeholder__::__wbindgen_cb_drop` has not been defined

Hello,

I am trying to build a package halo2_backend I am working on and import it into javascript.

I can build the package with cargo build --lib --release --package noir_halo2_backend_pse --target wasm32-wasi. However, when I try to initialize using wasmer-js or wasi-js, or if I try to use wasmtime by the cli, it always produces the same error:

 > wasmtime target/wasm32-wasi/release/noir_halo2_backend_pse.wasm
Error: failed to run main module `target/wasm32-wasi/release/noir_halo2_backend_pse.wasm`

Caused by:
    0: failed to instantiate "target/wasm32-wasi/release/noir_halo2_backend_pse.wasm"
    1: unknown import: `__wbindgen_placeholder__::__wbindgen_cb_drop` has not been defined

I've tried removing as many references to wasm-bindgen in a separate branch, including sub-dependencies, but have not progressed. Any suggestions on how I debug this issue would be greatly appreciated!

Start by reproducing the failure with the wasmtime command against target/wasm32-wasi/release/noir_halo2_backend_pse.wasm and inspect its imports, focusing on the wasm-bindgen placeholder and the listed runtimes. Trace which dependency or build configuration introduces that import; done means the cause is identified and the WASI module instantiates without the unknown import.