Desktop and panels become unclickable if opening multiple subwindows

Before making a bug report, is this known/does it also happen for others?

I can reproduce it like this:

  1. Open Configure Clipboard
  2. Click Actions Configuration
  3. Click Add Action
  4. Icons on desktop and panels becomes unclickable
  5. Close Add Action window
  6. Desktop and panels goes back to normal

Can others confirm this is the case for you?