Phasor ~> subdiv~ sequencing problem

EDIT: I have also considered that the flaw might be something with stash~, but I haven’t been able to identify it.

Hi, all, another sequencing question. I'm trying to build Philip Meyer's sequencer from the 16:00 mark of this video:

However something is not responding right for me. When I start off with a pattern using only step 1, that subdivided pulse does not trigger the MIDI player, even though it shows up in the scope. If I add other steps to the matrixctrl devise, suddenly step 1 plays, but it consistently gets skipped the first time. I'm pretty sure the issue is somewhere in subdiv~ because if I set its lockprob from 1 to 0, now all steps will always sound consistently, but they're out of phase with the main phasor~. In theory I could workaround by doing a "dummy" play with the sequencer before performing or recording but that's unsatisfying and leaves me thinking something else might go wrong. Any ideas are welcome.