The edge panels have never been great with the fold. You can't add or get any from the store, you're stuck with what Samsung preloads. You get what the OP had happen. I've even had to set up the contacts edge as it dropped half my contacts. Had it happen once on the fold 3, happened several times with the fold 2, usually after as jewel said changing themes.. This time on the fold 3 I did not change themes. With always having to set up the edges after theme changes on the fold 2, it cured me on my theme addiction, I haven't bought a theme for a year now. I used to buy a couple a month, so I should thank Samsung for saving me money with their crappy software on the edges on the folds.
I can only guess that Samsung is no longer interested in the edge panels. That is another nail in Samsungs coffin for me.