Sooooo, I have been on the phone with Apple Support several times this week. At this point... no fix other than, "the problem has been escalated to the engineers and they are working on something." I will say that Apple Support has been calling back to give updates, which is nice, but what would be nicer would be a fix. I use Tasks almost religiously to keep up with the 10 members of my team, not to mention my family.
On another note... Apple Reminders just flat out stinks. I don't know why they ever changed it from the first generation of reminders. I thought the new iOS13 revamp of reminders might offer something more user friendly, but it still stinks. No way to sort tasks by separate lists to see just a day view, or swipe to go to tomorrows tasks or anything like that. I have been using GoodTask for my task management app, and used to us TaskTask. Both are good... however, you would think Apple could come out with a Reminders app that would be halfway useful. My vote would be to re-introduce the original Reminders app that Apple offered years ago as a download on the app store. I would bet that by the amount of downloads of that app they receive they would realize how far they have drifted from their original simplicity.