I just installed KB5008353 and it is a little better seems to have solved a couple of my problems.
Hidden task bar is now showing when hovering over all parts of the task bar on primary and secondary monitors
Taskbar backgrounds still not showing on secondary monitors*
*-had to do the following to get that to work after every reboot.
-turned off automatically hide the task bar
-turned off show my taskbar on all displays
-turned them both back on
The start menu is still appearing in the top left of the screen after a minute or two.
How to get this update? It will be available through windows update soon (next scheduled patch Tuesday) but you can get it now via the Microsoft Update Catalog. Just grab the correct version for your PC.
If you're having problems with Windows Update you can get it manually above.