I did not file a report.Thanks for sharing BritSchwob. Unfortunate if Apple has to address specifically for each Mac model and has only done so for the Mac Mini M4 so far...
@GtrDude or anyone else, did you file a report about this for your Mac Mini M4 to get this fix in 15.6? If so can you share your issue # so that others can reference this as the same issue just on other models.
Just started using USB into XLR instead.
Basically gave up on the headphone out.
Now that 15.6 is out I may try it again.
USB is a major pain if the electricity goes out.
Don't know if my expensive Focal monitors can handle coming on at maximum power all that more often without blowing something.