I can confirm this. As a workaround, you can open /etc/laptop-mode/conf.d/usb-autosuspend.conf and either blacklist your devices or set BATT_SUSPEND_USB=0 to turn off usb suspension altogether. Restart laptop mode in PCC or with service laptop-mode restart in a root console, or reboot.
This means USB will not be powered down when not in use. A proper fix would involve investigating why it stays powered down when it should be in use, but I don't know enough about how it works to do that.
(Oops, there's an echo in the room - sorry, jif001, didn't notice you'd already suggested it!)