I tried this a couple times.
The first time I had mods on, there I only saw the Grim Reaper Icon. Then I turned mods off and played with the same household that I have been playing with for a while... and only had the Mini Reaper Icon.
I finally made a new household and placed them in a rental. Still mods off... I got the tasks... I did most of it, somehow I did one of the jobs (with the planting) twice, it just started again, but I was still waiting for the newsletter of the Ambrosia committee for the other job. I was waiting for a couple in-game days, never leaving the home lot... nothing.
Got frustrated, closed the game, restarted...
And then my discovery quests popped up, as I turned them on while figuring out why it wasn't working with mods as none of them should be interfering with the UI, so I turned those off again and restarted the game.
Since then I again only have the Mini Reaper, no tasks, I am 10EP away from "Scare Seeker Lot Challenge". I made a new Sim, put them on a normal lot, still no tasks.
I have not repaired the game yet, I have not de- and reinstalled the game yet, I have not made a new save yet. If nothing works until the weekend, I will try all of those.