Both these snippets should fail with notdir because the path contains a trailing slash. This behavior is consistent among Linux host, Wasmtime, WAMR, WasmEdge. Node however, successfully opens the file.

#include <fcntl.h>
#include <stdio.h>

int main() {
    int fd = open("file/", O_RDONLY);
    if (fd < 0) {
        perror("open");
        return 1;
    }

    return 0;
}

fn main() {
    unsafe {
        let base_fd = 3;
        let fd = wasi::path_open(base_fd, 0, "file/", 0, wasi::RIGHTS_FD_READ, 0, 0).unwrap();

        eprintln!("fd {fd}");
    }
}