Hi Robert
Thank you for getting back to me!
The problem is actually really simple. Make donuts/pies work like they always did in Kibana before 8, and still do in the rest of the world, particularly defined by excel and PowerBI. Example:
The values sum correctly, and the drawing represents the negative number by its ABS size.
I think that not many people (guess: less than 1 of 10.000) give it a thought, that numbers in a pie/donut in a puritan world of 360 degrees should equal 100% of the positive sum. In reality: No one cares! The important thing is, that the sum of buckets in the pie sum to 100% of the values in buckets, regardless if negative or positive.