Task is not created if "My Day" / "Important" lists are used

Hi, I'm having a weird issue currently and I believe it's not a "sync" issue.

I have a personal and a business account logged in my iOS app.
I also have each of these in the desktop app which allows me to quickly verify sync.

In my personal account, everything works great.
In my business account, whenever I add a task under "My Day" or "Important", it does not get synced upstream.
It shows in my mobile for some time and then disappears and it never pup in my desktop.

If instead, I add the task under some actual list (like default Tasks), it does get synced.
Also, if I add under "my day" and then edit it to assign to "Tasks" list too (for example), it gets synced as soon as added.

Any tasks added via desktop app work well and they are picked up by the mobile app.

One thing I noticed that happens in the desktop app is that when I create a task under Important or My Day, they get assigned the default list "Tasks".
When I create them in the mobile they don't get assigned any list by default.
And when I force the list, it works.

So it seems the issue is that those tasks are not getting the default list.

Also, on the iOS using my personal account, this does NOT happen.
If I create a task under Important, it DOES get "Tasks" list assigned to it (and properly syncs up).

I've been looking at app settings trying to understand if there's a "default list" setting but I could not find any.

Thanks