KDE Plasma Version: 6.5.6 here, just got the update…
I added a widget to the panel, but it dropped in the wrong place.
Previously I had a few options - I can go to edit mode, and also add or manage widgets.
I could previously hover and get a menu pop up, and I saw it just a minute ago - but it only flashed up in passing.
I cannot reliably call up a context menu to manage the widgets, can’t remove, can’t move them.