My Instructor residence status for Japan is valid until 2022. I left Japan two months ago to visit my country of citizenship, the US, with the intention of returning and starting a new job before 90 days had elapsed. Due to unforseen circumstances, I'm having to postpone my return to and employment in Japan until August or September.
I notified Immigration using the required form within several days of finishing my last employment, and got a "Special Re-entry Permit", valid for 1 year, stapled in my passport at the airport when I left the country (I have my zairyu card). However, my understanding is that my residence status can be revoked after 90 days of not engaging in my "designated activity".
If I accept an offer for a job in Japan starting in August or September, what should I do about my residence status? Do I assume it will be cancelled when I pass the 90-day mark? Do I need to request that Immigration cancel it before an employer applies for a new COE on my behalf? Or is there a way to keep it valid until my return?