When I run echo hi | wl-copy, I see the terminal flash, as well as the descriptor line at the top-left, and I see a window start to appear in dash to dock.
I originally noticed this via micro-editor/micro#1754, but I can reproduce it in a regular terminal as per above.
wl-copy --version: 2.0.0
Running on Fedora 32, Gnome Wayland 3.36.3.