On one installation of 20.04, snap refresh caused the snap-store snap to be updated, which made the orange "Ubuntu Software" icon disappear, and in its place is the "Snap Store" with a different icon. Same thing happened on another installation when updating "Snap Store" through the store itself.
How can I restore the original orange icon and "Ubuntu Software" label?
If your system still has this problem, the way to fix it is to run
snap refresh snap-store --channel=stable/ubuntu-20.04