You will see this if:
- KB5003214 is installed
- News and Interests on the taskbar is turned off, and
- Your DPI scaling (Settings|System|Display|Scale and layout is other (larger?) than 100%
Change any one of those, and the problem goes away. I found the most useful option to
be uninstalling KB5003214. I have zero interest in the News and Interests widget.
This problem not only persists with the June patch Tuesday update (KB5003637), but it now extends to 20H2 and 2004 in addition to 21H1. As if that weren't bad enough, this is no longer an optional update. If you uninstall it, it automatically re-installs itself unless you shut off automatic updates completely.
KB5003637 is supposed to be a security patch. New features, let alone ones that don't work and
break things that do, have no business being in a security patch!!!
You can uninstall KB5003637 and then block its re-installation using wushowhide.diagcab, but that's a lousy solution. You'll be missing the security patches in that update.