I am almost in a similar situation... I finish 7 months of application processing on Monday and no decision in sight. My work permit, house lease among other things are set to expire in another month. Moving back to India will lead to another set of updates to IRCC further delaying the process. Can't think of renewing them either for another year if the decision comes soon after.This process is getting scary for me. I passed the 6 months mark a week ago. My work contract ended in March so I had to move from the country I applied in and am back home waiting for PPR. If they send me a ADR request for PoF I can't show them the cash in hand I brought with me and my bank account will only show activity for the past 2 months when I transferred my money back home. Since I'm not in the country I was before, Japan, and my bank account there is closed, how the hell will I be able to contact the bank for info CIC might want? I feel like they will reject me because of this when I have the money but I have no way to prove it. I just want to start my life again which has been put on hold because they are taking so long!
Man... I wish they arrive at a decision any sooner.
About your situation, you could speak to the CIC reps and ask for guidance. If not, submit the changes via CSE form and a letter explaining your circumstances. You could attach the previous bank statement(s) in Japan for their perusal too.