问为什么具有相同源和目标的MoveFile会随机失败？

EN

#include <stdio.h>
#include <windows.h>

int main() {
    int i;

    CreateDirectory("testdir", NULL);
    CreateDirectory("testdir\\foo", NULL);
    CreateDirectory("testdir\\bar", NULL);

    for (i = 0; i < 10000; i++) {
        BOOL result;

        result = MoveFile("testdir\\bar", "testdir\\foo\\bar");
        if (!result) {
            fprintf(stderr, "rename bar => foo/bar: %d\n", GetLastError());
            return 1;
        }

        result = MoveFile("testdir\\foo", "testdir\\foo");
        if (!result) {
            fprintf(stderr, "rename foo => foo: %d\n", GetLastError());
            fprintf(stderr, "after %d iterations\n", i);
            return 1;
        }

        result = MoveFile("testdir\\foo\\bar", "testdir\\bar");
        if (!result) {
            fprintf(stderr, "rename foo/bar => bar: %d\n", GetLastError());
            return 1;
        }
    }

    return 0;
}

C:\Users\nik>cl /O2 rename.c
Microsoft (R) C/C++ Optimizing Compiler Version 16.00.30319.01 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

rename.c
Microsoft (R) Incremental Linker Version 10.00.30319.01
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:rename.exe
rename.obj

C:\Users\nik>rmdir /s /q testdir

C:\Users\nik>.\rename
rename foo => foo: 5
after 52 iterations

C:\Users\nik>rmdir /s /q testdir

C:\Users\nik>.\rename
rename foo => foo: 5
after 219 iterations

C:\Users\nik>rmdir /s /q testdir

C:\Users\nik>.\rename
rename foo => foo: 5
after 23 iterations