--bench --threads=1 gives different hash sum
I'm running xmrig in the benchmark mode with one or more threads. In the case of one thread the hash sum is always different, although it is still printed in green.

```
./xmrig --bench=1M --threads=1 -a rx/wow
...
[2025-01-31 15:24:27.570]  bench    benchmark finished in 1833.805 seconds (545.3 h/s) hash sum = 31301CC550306A59
```

```
./xmrig --bench=1M --threads=4 -a rx/wow
...
[2025-01-31 14:49:44.833]  bench    benchmark finished in 503.376 seconds (1986.6 h/s) hash sum = 0F3E5400B39EA96A
```

This is xmrig 6.22.2 on Linux. I've tried on several machines, so it is not a stability problem, including RPi5 (there you need to add `--randomx-no-numa` as they use NUMA now) and always the one-thread hash sum is different from more-thread one.  The same behavior is observed for  rx/0. Is this expected?