Hi Jason,
We don’t appear to be having this problem. I did some bulk checks last week so I ran a check on some that came back as deceased to see if the same thing happens for us. I did a check back to 1 July 2024 and 1 July 2025 and none of them are showing as deceased as at 1 July 2024 or as at 1 July 2025 like what is happening to you. I guess this may be a question for Centrelink.
Kind regards,
Matthew.