I've noticed some streaming platforms (eg Paramount Plus) occasionally fail to make use of the center speaker entirely when supposedly in 5.1; this makes the dialog nearly inaudible. I only get this issue with some content sources, and forcing the mixer into stereo mode alleviates the problem.
There are almost surely a whole host of bugs just outputting in the format the user has, never mind mixing issues, copyright protection, and similar.
There are almost surely a whole host of bugs just outputting in the format the user has, never mind mixing issues, copyright protection, and similar.