Restart button greyed out in Qube Manager for sys-*

Why is the restart button in Qube Manager for sys-usb, sys-net, sys-firewall greyed out, whereas it works fine in the Qubes Domains Widget? (By the way, the button for sys-whonix is not greyed out.)

It’s annoying, because I can only restart my disposable sys-* qubes from the widget and not from the Qube Manager (after disconnecting their network dependencies of course).

By the way, I do see the reason why it’s greyed out for dispVMs, however it’s still available in the widget for them.

Same here: all disposable sys-* qubes can start/stop only. Restart is greyed out…