gnome 3.30 crashes when Activity Favourites menu icon is dragged around quickly for a long time (10 seconds)
Open up the Activities screen and left-click and drag an icon (the Firefox icon for instance) around to reorder it in the stack of favourite applications along the left side of the screen. If you keep dragging it and quickly move the mouse up and down the list, gnome-shell will freeze and crash eventually.
I have reproduced this using the latest Fedora 29 Live iso as a LiveUSB and in a Boxes VM.
This does not occur on Gnome 3.28 included in Fedora 28.