In V2 the MxB needs a MIDI Start message before it starts the synced playing of the arpeggiator or sequencer when these are played from the keyboard.
If Logic can send a MIDI Start message, then it should work. DAWs and hardware clock sources usually send a Start message when you hit play. It seems that Logic has a few modes for how to start a synced slave. I'm not familiar with Logic, but from what I see
here, the "Pattern" mode might work.
This behaviour of the MxB will be reverted to not needing a Start message in the upcoming firmware.