Dash to dock icon is jiggling now? How to disable it?

I just Installed Manjaro Gnome. Dash to dock taskbar icon now sometimes jiggle.

I don’t understand what it’s for. I thought it was notification but if I clicked it, it does not stop jiggle.

How to disable it? I can’t found the settings in dash to dock.
Hmm. if it’s not notification, what is this for?