I have rescheduled my exam. In the email, I said that I was going to be back in Canada by Mid-August 2021. They replied to me saying that I will be rescheduled after Mid-August (whatever that means). Since the answer is vague, so there is no way to know. The post below shows exactly what I asked them and what they replied.
https://www.canadavisa.com/canada-i...e-online-citizenship-test.715081/post-9468243
There was another person in the forum that was in the same situation. This person asked to be rescheduled and said that would be back by end of April. He/she got the new invitation in the middle of May (two weeks after the return date). However, we can't draw conclusions from only one case. I think it depends on the office.
If you reschedule your exam, please share your experience on the thread that I mentioned above.