I have exactly the same problem.
If I execute the Fritzing from command line some additional information appears:
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
QWaylandShmBuffer: mmap failed (Invalid argument)
qt.svg: Duplicate unique style id: “SVGID_1_”
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
The 3 latest messages appear just right after dropping a component into one of the views.