My first question was why the markers were no longer visible, but when I reviewed my alerts, I saw the notice that they were being migrated. Now that I have set both favorites and alerts, I only see the favorites icon when I have selected to make them visible.

May not be a bug, but definitely is a change from the way it previously was visualized with no action on my part to select something I had previously set as an alert.

Today I methodically walked the steps...and was able to find a forecast and add a favorite. And from there I can create an alert.

But if I follow the instructions show in the menu...

I clicked on the map near the search bar for this example...

There does not appear the "...to the right of the search input..." as shown in the menu instructions.

If I go ahead and click the arrow on the pin, to see the detailed forecast, I do get the ability to add a favorite.

Now...I went ahead and set an alert for the area I am interested in...

There is no indicator on the map showing an alert is set for this location. Even with "My Favorties" clicked in the bar below...

If I edit the alert, it shows the location on the map, with the icon as if it were a favorite.

There is the easiest way to explain the issue. It goes from there...

In the below pic, I previously had 2...well...at this point I am not clear if I call them "alerts" or "favorites", but I had 2 things there that would appear each and every time I logged in.