Problem after each schedule, gets delayed even with Parallel execution

Hello guys, I already searched and see many people are with problems because the schedule doesn't control the execution time, and the workaround for this is the Parallel execution: [here](https://schedule.readthedocs.io/en/stable/parallel-execution.html)
Even after trying this, I still have the problem and even missed one call on date: 2023-02-15 21:03:11

> Current Time = 2023-02-15 21:03:09.996591
Current Time = 2023-02-15 21:03:10.999913
Current Time = 2023-02-15 21:03:12.000702
Current Time = 2023-02-15 21:03:13.002731

Can someone help me with this? I would appreciate it so much.
my code:
```
import time
from datetime import datetime, timedelta
import threading

def test():
current_time = datetime.now()
print("Current Time =", current_time, threading.current_thread())

def run_threaded(job_func):
job_thread = threading.Thread(target=job_func)
job_thread.start()

schedule.every(1).seconds.do(run_threaded, test)

if __name__ == "__main__":
while True:
schedule.run_pending()
time.sleep(1)
```

Start with the reported loop around schedule.run_pending(), run_threaded(), and time.sleep(1), then compare it with the linked Parallel execution documentation. Reproduce the missed interval using the shown timestamps and establish the expected scheduling behavior; done means the cause is confirmed and the behavior is covered by a clear explanation or regression test.

Written by the indexing model from the issue text.