Sequencer loop stopped working in update to 1.12

on latest mac but issue is on hardware too

In my initial app prototypes i had this file in which i set a sequence and then play it. this works.

On the latest version I call setLoops and play an empty sequence and it does not continue to play once i add notes. however strangely, if i start the loop over once notes have been added it still only plays the loop through once. I have tested the callback method but would prefert setLoops to work as the description indicates

downgrading SDK allows the code to run