This is happening to me as well. I got the Life & Death expansion pack when it first came out (I preordered) and, for me, there were no issues. But yesterday, for the first time since the pack came out, I tried playing the reaper career again. My sim was able to complete all of her first day training tasks at reaper headquarters, but when I was sent out in the field for training (by travelling via the scrying bowl) the game took me to an empty lot and Kenny, the dummy I was supposed to be practicing my reaping on, was nowhere to be found. The empty lot was in Strangerville and I searched eeeeeeeeverywhere but he was nowhere to be found. No dead bodies either (though according to the game it wasn't supposed to be an actual dead body because I was still in training - it was just supposed to be Kenny. But, yeah. No Kenny). Like another user said, when I tried the self-interaction "locate deceased sim" nothing happened.
Edit to add additional info: I tried reloading the save and, when that didn't work, I tried repairing my game, but no luck.