Sims neverending death glitch?

I have this current issue at the moment in my legacy save that the sims that I have played recently but moved onto a different household (the elderly parents of the sim I am currently playing in a different household) is eventually dying from old age but won’t actually die. I get a pop up saying that they have died but my sim does not receive a phone call to say they have died so I check on the relationship panel and they are still alive? I then repeatedly get the pop up to say they have died and where I want to store their inventory but they just haven’t died and it keeps going.

I have tried adding them to my recent household and they die immediately, the grim reaper appears and takes their body away but they just reappear as a living sim and the grave is empty (no name) and then it repeats again. I haven’t had an issue with other sims that have died (my households that are descendants in the family tree that I have not touched or played recently). It is also weird when I go onto the family tree and it is saying some of the sims that have been dead for months are alive now when they are not??

I have tried repairing my game but I still have this issue until I get to a point where I go into CAS and make them a ghost myself as they just won’t die and then get their grave from the funeral.

Has anyone had this issue before and have managed to fix it?