Update: The deadline has now passed.
MtGox Creditors who filed a bankruptcy claim should have received a notification in June 2018 from the MtGox Trustee regarding the switch to civil rehabilitation proceedings.
The deadline for submitting your claim for the civil rehabilitation proceedings is October 22, 2018. This is different from the claim you may have submitted for the bankruptcy proceedings and must be done to ensure you receive a payout.
If you have only submitted a claim for the bankruptcy proceedings at this stage, then you need to submit a second claim for the rehabilitation proceedings by October 22, 2018 (Japan Standard Time).