Looks like a bug. There is a trigger for Matter based lock actions, so they should also be reported. Thank you for pointing it out, we’ll look into it.
According to the current spec Matter is a separate trigger, but Bluetooth/WiFi/Thread are not. If you want these you’d need to create a new feature request. Just fyi - the value add of it is relatively limited, because the Apps will choose whichever channel works best for them at the moment. i.e. a lock command from an App triggered via Thread does not necessarily mean that the user has been remote.