OPFS breaks with -pthread -sPROXY_TO_PTHREAD -sJSPI

[paradust7]

Version of emscripten/emsdk:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 6.0.8 (aeb6792)
clang version 24.0.0git (https:/github.com/llvm/llvm-project 4bfd08c2d769736841ae4f5705d76fa6daa39027)
Target: wasm32-unknown-emscripten
Thread model: posix

Minimal reproducer

#include <emscripten/wasmfs.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main(void) {
  printf("creating OPFS backend\n");
  backend_t opfs = wasmfs_create_opfs_backend();
  if (!opfs) {
    printf("FAIL: no OPFS backend\n");
    return 1;
  }
  printf("mounting /opfs ...\n");
  if (wasmfs_create_directory("/opfs", 0777, opfs) != 0) {
    printf("FAIL: could not mount /opfs\n");
    return 1;
  }
  printf("PASS\n");
  return 0;
}

Build with
emcc minimal.c -o minimal.html -sWASMFS -pthread -sPROXY_TO_PTHREAD -sJSPI

Run with
emrun --browser chrome minimal.html

Expected
It should print PASS.

What actually happens
Javascript error in the console:

Uncaught (in promise) SuspendError: trying to suspend without WebAssembly.promising

[sbc100]

@tlively ?