It has corrected itself for now, but this has happened once before and the only software that can effect the taskbar is windows explorer, and start 10 (1.97) Newest version since it says there are no new updates when clicked.
I run Windows 10 below:
(Edition Windows 10 Pro
Version 21H1
Installed on 5/18/2021
OS build 19043.1165
Experience Windows Feature Experience Pack 120.2212.3530.0)
cannot make a video but all I do is move the cursor to the taskbar which is always up in one row position (I don't have the Hide the taskbar switched on) as you can see in the pictures the only way to get to my icons that work is to have the row at double height. The icons that show up and are not working are older icons that are no longer on the system in the bottom row(some of them are still installed like firefox.