I have the same computer. It doesn’t have this problem, but it does have some idiosyncrasies (once a day it stops downloading or uploading files and has to be restarted). I do see that the MacBooks have a dual output audio, and that occasionally software will recognize something like the headphone output as a “separate playback engine”.
Members of this Avid forum seemed to re-route the situation with Rogue Omega Loopback, although they are working with ProTools: with https://duc.avid.com/showthread.php?t=411386