Quirk with raw decimal MIDI message in M4L // Live 12 ?

Hello! I am working on a patch which controls a bit of hardware via MIDI. I have a pretty realized control schema up and working, including reverse engineering the sysex. We now have a successful implementation which is intermediating Sysex dumps via JS and a byte table in a json dict etc, my colleagues and I have gone pretty far with this.

The manual for the HW device provides a raw MIDI formatted message to call a preset dump of the current edit. (240 28 96 1 0 124 70 69 52 54 66 67 is the message itself)

I am working in Live Suite 11, max 8.6.1, and simply putting that decimal sequence into a message box and banging it to a Midiout has been sufficient to call preset dumps. It seems a little sketchy, sometimes two commands have to be issued for it to work, but it is essentially functional. My colleague is working in live 12, max 8.6.5 however (he just updated) and this same message formatting does not seem to call the current edit dump as expected // as it does in my environment. What gives?

Was there a change to the handling of this type of midi message in the recent update? Do I need to prepare the decimal string somehow now with a ctlout et al ? Is there a better approach I should consider to handling this type of sysex request globally ?

Thanks so much!