IMPORTANT: I do not have Life and Death EP. I do not have mods, I do not use CC. I am a vanilla sims legacy player. All of these issues have started within the last month of gameplay.
It started out not being something I paid attention to... A townie died on my lot and the "Become a playable ghost/become a free roaming ghost" popped up. Because they weren't part of my family I picked the latter. Their gravestone didn't appear on the lot, but I figured I was just because they weren't in my family. (even though in the past I had townie graves pop up in other save files.) I just brushed it off.
Until it happened again with another townie, but this time the grim reaper did not move when he appeared on the lot. He didn't do his action, and the body stayed on the floor for SEVERAL minutes. I debug cheated the reaper and the selection menu appeared. This time I chose "become playable ghost" just to see what would happen... the gravestone appeared in the sim's inventory.
Then two of MY sims died. The Grim Reaper did not move, and the body stayed on the floor. I debug cheated the body this time, and the selection menu appeared. I didn't think about the last time, because at this point I hadn't realized the connection between all the situations, so I chose "become free roaming ghost." The body disappeared, but the gravestone didn't appear on the lot or in my family inventory. I didn't have time to think about its before the next elder sim in my house died one sim day later. This time, I chose "become playable ghost" but the sim did not enter my household, and the gravestone did not appear in my inventory.
I exited the lot without saving, came back, and the second elder sim was still alive. She was still ready to die, and this time I chose "become free roaming ghost." The same result. Now, the first elder who died appeared as a ghost in the sim relationship panel of his children. His ghost has not been roaming the lot as happens upon most sims deaths. The mother still appears as a human in the sim relationship panel, but there are no interactions to invite to lot, as like what happens when the ghost is in the panel. Her grave is not present, she's not in the family, and I have not see her ghost roaming around the house.
I am frustrated because these sims are members of my legacy family, and I'm concerned what it will mean for my family tree. Will these sims stay in the tree if their ghosts didn't ever appear in the world? I can't put their graves in the cemetery, so family members can't grieve, strengthen connection, etc. If this is going to be a recurring problem with my legacy I'm not inclined to continue playing. I don't want to lose the digital memory of these sims...That's the way I play the game! To build families and watch the generations in different scenarios. This series of glitches really has ruined gameplay for me.