Created attachment 110610 [details] Both widgets It's very confusing to see the "Standard widget" floating around on the desktop - makes no sense in my opinion
It's a design decision. Your comment has been noted, and it is up for discussion, but it's not a bug.
You can disable the desktop toolbox, RMB > Configure Desktop > Tweaks. You can also disable the panel toolbox by locking widgets. It is suggested you always do after finishing customization and start with work.