You can watch both videos where readings are different then what I have posted but both these videos are before the update. It may be that you have corrected the behaviour of manifold pressure at these altitudes or goes wrong. Please guide me on that.
https://www.youtube.com/watch?v=YXenEWyGIoM&t=173s
https://www.youtube.com/watch?v=ooXdnkZChJ0&t=121s