I have recently installed Ubuntu 20.04 Beta and when I open Show Applications window with Super key and try to launch any app, it won't open, although the system shows that the app has been opened. Moreover, I cannot go back to the desktop from Show Applications window, it just keeps "hanging above" all other system windows and apps. Only reboot works.
sudo apt update won't solve your problem(as of now), since the package is not updated there.
Installing the latest version from github will solve.
- clone https://github.com/home-sweet-gnome/dash-to-panel
- logout and login
- tweaks -> extension -> dashtopanel
Also, the same issue is addressed here https://github.com/home-sweet-gnome/dash-to-panel/issues/1131